Bers

differentia n.; pl. -tiae [L. differentia, difference] The specific difference of one species from other species of the same genus.

differential diagnosis A statement of characters distinguishing a given taxon from other specifically mentioned equivalent taxa. see delimitation.

diffracted a. [L. dis, twice; frangere, to break] 1. Bent in different directions. 2. Separated into parts.

diffusate n. [L. diffusus, spread out] Material that diffuses through a semi-permeable membrane; dialyzate.

diffuse a. [L. diffusus, spread out] 1. Not sharply distinct at the edge or margin. 2. Widely spread; extended. 3. (MOLL: Gastropoda) The aperture when spread out or widened.

diffusion n. [L. diffusus, spread out] The spreading of a dissolved substance through solvent by virtue of the random movements of its molecules or ions.

diffusion tracheae (ARTHRO: Insecta) Cylindrical tracheae not subject to collapse. see ventilation tracheae.

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