The influence of light on the movements of low organisms, as various infusorians, the zoospores of certain alg/, etc.; also, the tendency to follow definite directions of motion or assume definite positions under such influence. If the migration is toward the source of light, it is termed positive phototaxis; if away from the light, negative phototaxis.

Telegraphy by means of light, as by the heliograph or the photophone. Also, less properly, telephotography.

A telescope adapted for taking photographs of the heavenly bodies.

An arrangement of two photographic cameras, the plates of which may be brought into exactly the same plane, used in surveying and map making. From the differences between two pictures taken at the same moment, measurements in all dimensions of the region may be obtained.

The application of light for therapeutic purposes, esp. for treating diseases of the skin.

Of or pertaining to both light and heat.

A motile condition in plants resulting from exposure to light.

Photogrammetry.

Designating a photomechanical process for making reproductions in natural colors by three printings.

of or pertaining to phototropism; exhibiting phototropism; same as Heliotropic.

The tendency of growing plant organs to move or curve under the influence of light. In ordinary use the term is practically synonymous with heliotropism.

A plate or block with a printing surface (usually in relief) obtained from a photograph; also, any one of the many methods of processes by which such a printing surface is obtained.

Of or pertaining to a phototype or phototypy.

Same as Phototypy.

The art or process of producing phototypes.

Of certain achromatic lenses, having the same focus for the actinic and for the brightest of the visual rays.

The process of producing a representation of an object on wood, by photography, for the use of the wood engraver.

A print made by photozincography.

A process, analogous to photolithography, for reproducing photographed impressions transferred to zinc plate.

The thin chambered shell attached to the anterior end of a belemnite.

The siphon of a phragmocone.

Of the nature of a phrase; consisting of a phrase; as, a phrasal adverb.

To use proper or fine phrases.

Indescribable.

A symbol for a phrase.

Of or pertaining to phraseology; consisting of a peculiar form of words.

A collector or coiner of phrases.

Manner of expression; peculiarity of diction; style.

Method of expression; association of words.

A subdivision of a phyle, or tribe, in Athens.

Subterranean; -- applied to sources supplying wells.

One who is phrenetic.

Relating to phrenitis; suffering from frenzy; delirious; mad; frantic; frenetic.

Of or pertaining to the diaphragm; diaphragmatic; as, the phrenic nerve.

A combining form meaning, of or pertaining to the diaphragm, the mind, or the brain; frenic.

That branch of science which relates to the mind; mental philosophy.

See Vital force, under Vital.

Inflammation of the brain, or of the meninges of the brain, attended with acute fever and delirium; -- called also cephalitis.

An instrument for registering the movements of the diaphragm, or midriff, in respiration.

A phrenologist.

Phrenological.

Of or pertaining to phrenology.

One versed in phrenology; a craniologist.

The science of the special functions of the several parts of the brain, or of the supposed connection between the various faculties of the mind and particular organs in the brain.

The power of exciting the organs of the brain by magnetic or mesmeric influence.

A cerebroside, related to cerebrin, present in white matter of the brain.

See Frenzied.

To render frantic.

See Phrenetic.

Any insect belonging to the Phryganeides.

A tribe of neuropterous insects which includes the caddice flies; -- called also Trichoptera. See Trichoptera.

A native or inhabitant of Phrygia.

A salt of phthalic acid.

One of a series of artificial organic dyes made as condensation products of the phenols with phthalic acid, and well represented by phenolphthalein. Their alkaline solutions are fluorescent.

Pertaining to, or designating, a dibasic acid obtained by the oxidation of naphthalene and allied substances.

A lactone (C8H6O2) obtained as a white crystalline substance by reduction of phthalyl chloride and other processes; hence, by extension, any one of the series of which phthalide proper is the type.

An imido derivative of phthalic acid, obtained as a white crystalline substance, C6H4.(CO)2NH, which has itself (like succinimide) acid properties, and forms a series of salts. Cf. Imido acid, under Imido.

A colorless crystalline substance obtained by reduction from phthalein, into which it is easily converted by oxidation; hence, any one of the series of which phthalin proper is the type.

The hypothetical radical of phthalic acid.

A disease (morbus pediculous) consisting in the excessive multiplication of lice on the human body.

Of or pertaining to phthisis; affected with phthisis; wasting; consumptive.

Having phthisis, or some symptom of it, as difficulty in breathing.

A treatise on phthisis.

Pulmonary consumption; tuberculosis of the lungs.

A wasting or consumption of the tissues. The term is now obsolete; it was once applied to many wasting diseases, but in the early 1900's became restricted to tuberculosis of the lungs (pulmonary phthisis, or consumption). See Consumption.

A vocalized element or letter.

An instrument for measuring vocal sounds.

Fluorine.

See Erythrite, 1.

A bluish green coloring matter of certain alg/.

A blue coloring matter found in certain algae.

A red coloring matter found in algae of the subclass Florideae.

A description of seaweeds.

The science of algae, or seaweeds; algology.

A gelatin in which the algae spores have been supposed to vegetate.

A large, important class of parasitic or saprophytic fungi, the algal or algalike fungi. The plant body ranges from an undifferentiated mass of protoplasm to a well-developed and much-branched mycelium. Reproduction is mainly sexual, by the formation of conidia or sporangia; but the group shows every form of transition from this method through simple conjugation to perfect sexual reproduction by egg and sperm in the higher forms.

A brown coloring matter found in certain alg/.

A yellowish coloring matter found in certain algae.

A phylactery.

Wearing a phylactery.

Of or pertaining to phylacteries.

Any charm or amulet worn as a preservative from danger or disease.

A branch of a plumularian hydroid specially modified in structure for the protection of the gonothec/.

An order of fresh-water Bryozoa in which the tentacles are arranged on a horseshoe-shaped lophophore, and the mouth is covered by an epistome. Called also Lophopoda, and hippocrepians.

Of or pertaining to the Phylactol/ma.

Same as Phylactol/ma.

The chief of a phyle, or tribe.

The office of a phylarch; government of a class or tribe.

A local division of the people in ancient Athens; a clan; a tribe.

A mineral related to ottrelite. Clay slate; argillaceous schist.

A crustacean gill composed of lamellae.

A flattened stem or branch which more or less resembles a leaf, and performs the function of a leaf as regards respiration and assimilation.

A genus consisting of celery pine.

A blue coloring matter extracted from chlorophyll.

The cavity of a hydrophyllium.

Same as Phyllodium.

Having phyllodia; relating to phyllodia.

A petiole dilated into the form of a blade, and usually with vertical edges, as in the Australian acacias.

A retrograde metamorphosis of the floral organs to the condition of leaves.

Resembling a leaf.

An abnormal or excessive production of leaves.

A foliar part of a plant; any organ homologous with a leaf, or produced by metamorphosis of a leaf.

The succession and variation of leaves during different seasons.

One of a group of marsupials including the phalangists. One of a tribe of beetles which feed upon the leaves of plants, as the chafers.

Substituting on leaves; leaf-eating.

Leaf-bearing; producing leaves.

One of the Phyllopoda. [Also used adjectively.]

An order of Entomostraca including a large number of species, most of which live in fresh water. They have flattened or leaflike legs, often very numerous, which they use in swimming. Called also Branchiopoda.

Of or pertaining to the Phyllopoda.

Of or pertaining to Phyllorhina and other related genera of bats that have a leaflike membrane around the nostrils.

The larva of the spiny lobsters (Palinurus and allied genera). Its body is remarkably thin, flat, and transparent; the legs are very long. Called also glass-crab, and glass-shrimp.

Any bat of the genus Phyllostoma, or allied genera, having large membranes around the mouth and nose; a nose-leaf bat.

A phyllostome.

Of or pertaining to phyllotaxy.

The order or arrangement of leaves on the stem; the science of the relative position of leaves.

Homologous with a leaf; as, the sepals, petals, stamens, and pistils are phyllous organs.

A yellow coloring matter extracted from chlorophyll.

A small hemipterous insect (Phylloxera vastatrix) allied to the aphids. It attacks the roots and leaves of the grapevine, doing great damage, especially in Europe.

A natural family consisting of the plant lice.

Relating to phylogenesis, or the evolutionary history of a type of organism.