O*nag"ga (?), n. (Zoöl.) The dauw.
{ On`a*gra"ceous (n`*gr"shs), On`a*gra*ri"e*ous (-gr*r"*s), } a. [From
NL. Onagra an old scientific name of the evening primrose (Œnothera),
fr. Gr. 'ona`gra a kind of plant; of uncertain origin.] (Bot.)
Pertaining to, or resembling, a natural order of plants (Onagraceæ or
Onagrarieæ), which includes the fuchsia, the willow-herb (Epilobium),
and the evening primrose (Œnothera).
O"nan*ism (?), n. [Onan (Gen. xxxviii. 9): cf. F. onanisme.]
Self-pollution; masturbation.
||O*nap"po (?), n. (Zoöl.) A nocturnal South American monkey
||(Callithrix discolor), noted for its agility; -- called also
||ventriloquist monkey.
Once (?), n. (Zoöl.) The ounce.
Once (?), adv. [OE. ones, anes, an adverbial form fr. one, on, an, one.
See One-, -Wards.] 1. By limitation to the number one; for one time;
not twice nor any number of times more than one.
Ye shall . . . go round about the city once.
Josh. vi. 3.
Trees that bear mast are fruitful but once in two years.
Bacon.