1764, "sound made by snuffling," from snuffle (v.). Old English had snofl (n.) "phlegm, mucus." The snuffles "troublesome mucous discharge from the nostrils" is from 1770.
1610s, "secreting or containing mucus," originally in reference to the small glands under the cerebrum, from Latin pituitarius "mucous," from pituita "clammy moisture, phlegm, mucus, slime," a word of unknown etymology. Taken as the name for the gland because it was believed that it channeled mucus to the nose. As a noun by 1899.
"mucous membrane of the inner surface of the eyelids," 1540s, medical Latin, short for membrana conjunctiva "conjunctive membrane" (see conjunctive). So called because it conjoins the lids and the globe of the eye. Related: Conjunctival.
"a secretion of the sebaceous glands," 1728, from medical use of Latin sebum "sebum, suet, grease," which is perhaps related to sapo "soap" (see soap (n.)), but de Vaan is skeptical and gives it no etymology.
1530s, "waste discharged from the body," from Latin excrementum, from stem of excretus, past participle of excernere "to sift out, discharge," from ex "out" (see ex-) + cernere "sift, separate" (from PIE root *krei- "to sieve," thus "discriminate, distinguish"). Originally any bodily secretion, especially from the bowels; exclusive sense of "feces" is since mid-18c. Related: Excremental; excrementitious.
also antiperspirant, 1935, in advertisements for Nonspi ("The Safe Anti-Perspirant for Fastidious Women"), from anti- + perspire, probably modeled on older deodorant. Technically an application preventing or restricting the flow of perspiration, as opposed to a deodorant, which deodorizes only and in no way affects secretion.
chemical formed in the pineal gland of mammals that regulates certain physiological activities, 1958, from Greek melas "black, dark" (see melano-) + ending from serotonin. So called because its secretion is inhibited by sunlight, or because it changes the skin color of certain reptiles and amphibians.
"to throw out or eliminate," specifically "to eliminate from an body by a process of secretion and discharge," 1610s, from Latin excretus, past participle of excernere "to sift out, discharge," from ex "out" (see ex-) + cernere "sift, separate" (from PIE root *krei- "to sieve," thus "discriminate, distinguish"). Related: Excreted; excreting.