Etymology
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dose (n.)

early 15c., "the giving of medicine (in a specified amount or at a stated time)," from Old French dose (15c.) or directly from Medieval Latin dosis, from Greek dosis "a portion prescribed," literally "a giving," used by Galen and other Greek physicians to mean an amount of medicine, from stem of didonai "to give" (from PIE root *do- "to give").

Meaning "quantity of medicine given or prescribed" is from c. 1600. Extended sense, in reference to anything given to be "swallowed," literal or figurative, is from c. 1600. Slang meaning "a case of venereal disease" is by 1914.

dose (v.)

1650s, "give medicine to;" 1713, "administer in doses," from dose (n.). Related: Dosed; dosing.

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Definitions of dose
1
dose (n.)
a measured portion of medicine taken at any one time;
Synonyms: dosage
dose (n.)
the quantity of an active agent (substance or radiation) taken in or absorbed at any one time;
Synonyms: dosage
dose (n.)
a communicable infection transmitted by sexual intercourse or genital contact;
Synonyms: venereal disease / vd / venereal infection / social disease / Cupid's itch / Cupid's disease / Venus's curse / sexually transmitted disease / std
dose (n.)
street name for lysergic acid diethylamide;
Synonyms: acid / back breaker / battery-acid / dot / Elvis / loony toons / Lucy in the sky with diamonds / pane / superman / window pane / Zen
2
dose (v.)
treat with an agent; add (an agent) to;
The ray dosed the paint
dose (v.)
administer a drug to;
Synonyms: drug
From wordnet.princeton.edu