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D layer the lowest layer of the ionosphere, about forty-five to eighty miles above the earth.
dm abbreviation of "decimeter," or "decimeters," a unit of length equal to one tenth of a meter or 3.937 inches.
DMSO a colorless nontoxic liquid that penetrates the skin rapidly, used as a solvent and sometimes a medicine; dimethyl sulfoxide.
DMV abbreviation of "Department of Motor Vehicles."
DMZ abbreviation of "demilitarized zone."
DNA abbreviation of deoxyribonucleic acid; any of several acids occurring mainly in cellular nuclei and involved in the transmission of hereditary traits and the formation of proteins..
do1 to complete or carry out to completion; perform. [11 definitions]
do2 in music, the syllable that denotes the first or last tone of a diatonic scale. (See sol-fa.) [2 definitions]
do or die to make the ultimate effort.
D.O.A. abbreviation of "dead on arrival."
doable able to be done; possible.
do away with to abolish, discard, or discontinue. [2 definitions]
DOB an abbreviation for "date of birth."
dobbin a horse, esp. a plodding one used as a workhorse.
Doberman pinscher a breed of large dog that has short, smooth, usu. black hair with tan markings, often used as a guard dog.
dobra the chief monetary unit of St. Thomas and Principe, equaling one hundred centimos. [2 definitions]
Dobro trademark for a type of acoustic steel guitar that is held on the lap and fretted with a metal bar or tube. [2 definitions]
dobsonfly a large insect with four membranous, veiny wings, whose carnivorous larvae live in water. (See hellgrammite.)
doc (informal) doctor, esp. as a term of address.
docent a lecturer at a college or university who is not a regular member of the faculty. [2 definitions]
docile obedient and easy to manage. [2 definitions]