dorsum. The back, the posterior part of an organ.
drainage. (Surgically) The gradual removal of the contents of a suppurating cavity.
d.s. or s. Used in prescription writing, meaning to give directions.
dynia. Pain, as in pleurodynia, pain in the pleura.
E
ecchymosis. An extravasation of blood or slight hemorrhage under the skin resulting in a purplish patch.
echinococcus. The larval stage of the dog tapeworm, occurring also in human organs or tissues.
ectomy. To cut out, as in prostatectomy, removal of a part or all of the prostate.
eczema. Inflammation of the skin (acute or chronic, moist or dry), accompanied by itching and burning.