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diaphanous of fabric or the like, almost transparent; sheer; filmy; delicate. [2 definitions]
diaphoresis perspiration, esp. when heavy or medically caused.
diaphragm in anatomy, a wall of muscle or membranous material separating two spaces, esp. the muscle wall separating the thorax and abdomen in mammals. [5 definitions]
diaphysis the shaft or middle part of a long bone.
diarrhea an intestinal condition characterized by frequent and watery bowel movements.
diary a daily record, esp. of a person's experiences, reflections, and private thoughts. [3 definitions]
Diaspora the scattering of Jews among the Gentiles after the Babylonian exile. [3 definitions]
diastase an enzyme that changes starch into sugar, found in the seed of grains, malt, and the like; amylase.
diastole in physiology, the normal rhythmic expansion of the heart chambers, during which the chambers fill with blood. (Cf. systole.)
diastrophism the process by which the surface of the earth changes in shape and levels because of movements of the earth's crust. [2 definitions]
diathermy medical treatment of localized tissues by heating with electromagnetic waves.
diatom any of various tiny single-celled algae having cell walls of silica.
diatomic of a molecule, composed of two atoms. [2 definitions]
diatonic in music, being or using a standard major or minor scale of eight notes to the octave, without chromatic tones.
diatribe a bitter, abusive attack in speech or writing.
diatropism the tendency of some plant organs to assume a position at a right angle to the direction of an external stimulus.
diazepam a tranquilizing drug that relaxes the muscles and relieves anxiety and depression.
diazine any chemical compound in which four carbon atoms and two nitrogen atoms are arranged in a ring.
dibasic designating an acid having two replaceable hydrogen atoms. [2 definitions]
dibble a small pointed hand tool used to make holes in the ground for bulbs, seeds, or the like. [2 definitions]
dibranchiate any of various tentacled mollusks, such as octopus and squid, that have one pair of gills.