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diamine any of various chemical compounds containing two amino groups.
diamond a clear, very hard crystalline form of carbon, used in jewelry and in abrasives and cutting tools. [7 definitions]
diamondback any of several rattlesnakes or turtles having diamond-shaped markings.
diamond wedding a sixtieth or seventy-fifth wedding anniversary.
Diana in Roman mythology, a goddess associated with the moon and hunting, and a protector of women; Artemis.
dianthus any of various plants related to pinks, such as the carnation or sweet william.
diapason a rich, swelling passage of harmonious music. [3 definitions]
diaper a baby's undergarment of absorbent cloth or paper folded between the legs and fastened at the waist. [2 definitions]
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]