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Diaheliotropism

A tendency of leaves or other organs of plants to have their dorsal surface faced towards the rays of light.

Dial

To measure with a dial.

Dialect

Means or mode of expressing thoughts; language; tongue; form of speech.

Dialectal

Relating to a dialect; dialectical; as, a dialectical variant.

Dialectician

One versed in dialectics; a logician; a reasoner.

Dialectics

That branch of logic which teaches the rules and modes of reasoning; the application of logical principles to discursive reasoning; the science or art of discriminating truth from error; logical discussion.

Dialectology

That branch of philology which is devoted to the consideration of dialects.

Dialing

The art of constructing dials; the science which treats of measuring time by dials.

Dialist

A maker of dials; one skilled in dialing.

Diallage

A dark green or bronze-colored laminated variety of pyroxene, common in certain igneous rocks.

Diallel

Meeting and intersecting, as lines; not parallel; -- opposed to parallel.

Diallyl

A volatile, pungent, liquid hydrocarbon, C6H10, consisting of two allyl radicals.

Dialogism

An imaginary speech or discussion between two or more; dialogue.

Dialogite

Native carbonate of manganese; rhodochrosite.

Dialytic

Having the quality of unloosing or separating.

Dialyze

To separate, prepare, or obtain, by dialysis or osmose; to pass through an animal membrane; to subject to dialysis.

Dialyzed

Prepared by diffusion through an animal membrane; as, dialyzed iron.

Dialyzer

The instrument or medium used to effect chemical dialysis.

Diamagnetic

Any substance, as bismuth, glass, phosphorous, etc., which in a field of magnetic force is differently affected from the ordinary magnetic bodies, as iron; that is, which tends to take a position at right angles to the lines of magnetic force, and is repelled by either pole of the magnet. Contrasted with paramagnetic and ferromagnetic.

Diamagnetism

The science which treats of diamagnetic phenomena, and of the properties of diamagnetic bodies.

Diameter

Any right line passing through the center of a figure or body, as a circle, conic section, sphere, cube, etc., and terminated by the opposite boundaries; a straight line which bisects a system of parallel chords drawn in a curve. A diametral plane.

Diametrically

In a diametrical manner; directly; as, diametrically opposite.

Diamide

Any compound containing two amido groups united with one or more acid or negative radicals, -- as distinguished from a diamine. Cf. Amido acid, under Amido, and Acid amide, under Amide.

Diamido-

A prefix or combining form of Diamine.

Diamine

A compound containing two amido groups united with one or more basic or positive radicals, -- as contrasted with a diamide.

Diamond

Resembling a diamond; made of, or abounding in, diamonds; as, a diamond chain; a diamond field.

Diamond-back

The salt-marsh terrapin of the Atlantic coast (Malacoclemmys palustris).

Diamonded

Having figures like a diamond or lozenge.

Diamondize

To set with diamonds; to adorn; to enrich.

Diamylene

A liquid hydrocarbon, C10H20, of the ethylene series, regarded as a polymeric form of amylene.

Diana

The daughter of Jupiter and Latona; a virgin goddess who presided over hunting, chastity, and marriage; -- identified with the Greek goddess Artemis.

Diandria

A Linn/an class of plants having two stamens.

Diandrous

Of or pertaining to the class Diandria; having two stamens.

Dianoetic

Pertaining to the discursive faculty, its acts or products.

Dianoialogy

The science of the dianoetic faculties, and their operations.

Dianthus

A genus of plants containing some of the most popular of cultivated flowers, including the pink, carnation, and Sweet William.

Diapasm

Powdered aromatic herbs, sometimes made into little balls and strung together.

Diapason

The octave, or interval which includes all the tones of the diatonic scale. Compare disdiapason.

Diapedesis

The passage of the corpuscular elements of the blood from the blood vessels into the surrounding tissues, without rupture of the walls of the blood vessels.

Diapensiaceae

a natural family of northern temperate low evergreen plants; in some classifications placed in its own order Diapensiales.

Diapensiales

an order of plants, used in some classifications as coextensive with the family Diapensiaceae.

Diaper

To draw flowers or figures, as upon cloth.

Diaphane

A woven silk stuff with transparent and colored figures; diaper work.

Diaphaneity

The quality of being diaphanous; transparency; pellucidness.

Diaphanic

Having power to transmit light; transparent; diaphanous.

Diaphanie

The art of imitating stained glass with translucent paper.

Diaphanometer

An instrument for measuring the transparency of the air.

Diaphanoscope

A dark box constructed for viewing transparent pictures, with or without a lens.

Diaphanotype

A colored photograph produced by superimposing a translucent colored positive over a strong uncolored one.

Diaphanous

Allowing light to pass through, as porcelain; translucent or transparent; pellucid; clear.

Diaphemetric

Relating to the measurement of the tactile sensibility of parts; as, diaphemetric compasses.

Diaphonics

The doctrine of refracted sound; diacoustics.

Diaphoresis

Perspiration, or an increase of perspiration.

Diaphoretic

A medicine or agent which promotes perspiration.

Diaphote

An instrument designed for transmitting pictures by telegraph.

Diaphragm

A dividing membrane or thin partition, commonly with an opening through it.

Diaphragmatic

Pertaining to a diaphragm; as, diaphragmatic respiration; the diaphragmatic arteries and nerves.

Diaphysis

An abnormal prolongation of the axis of inflorescence.

Diapnoic

Slightly increasing an insensible perspiration; mildly diaphoretic. A gentle diaphoretic.

Diapophysis

The dorsal transverse, or tubercular, process of a vertebra. See Vertebra.

Diarchy

A form of government in which the supreme power is vested in two persons.

Diarrhoea Diarrhea

A morbidly frequent and profuse discharge of loose or fluid evacuations from the intestines, without tenesmus; a purging or looseness of the bowels; a flux.

Diarthrodial

Relating to diarthrosis, or movable articulations.

Diarthrosis

A form of articulation which admits of considerable motion; a complete joint; abarticulation. See Articulation.

Diary

lasting for one day; as, a diary fever.

Diaspora

Lit., /Dispersion./ -- applied collectively: (a) To those Jews who, after the Exile, were scattered through the Old World, and afterwards to Jewish Christians living among heathen. Cf. James i. 1. (b) By extension, to Christians isolated from their own communion, as among the Moravians to those living, usually as missionaries, outside of the parent congregation.

Diaspore

A hydrate of alumina, often occurring in white lamellar masses with brilliant pearly luster; -- so named on account of its decrepitating when heated before the blowpipe.

Diastase

A soluble enzyme, capable of converting starch and dextrin into sugar.

Diastasic

Pertaining to, or consisting of, diastase; as, diastasic ferment.

Diastasis

A forcible separation of bones without fracture.

Diastatic

Relating to diastase; having the properties of diastase; effecting the conversion of starch into sugar.

Diastem

Intervening space; interval. An interval.

Diastema

A vacant space, or gap, esp. between teeth in a jaw.

Diaster

A double star; -- applied to the nucleus of a cell, when, during cell division, the loops of the nuclear network separate into two groups, preparatory to the formation of two daughter nuclei. See Karyokinesis.

Diastole

The rhythmical expansion or dilatation of the heart and arteries; -- correlative to systole, or contraction.

Diathermanism

The doctrine or the phenomena of the transmission of radiant heat.

Diathermanous

Having the property of transmitting radiant heat; diathermal; -- opposed to athermanous.

Diathermic

Affording a free passage to heat; as, diathermic substances.

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