1. any of numerous plants of the family Geraniaceae;
The Collaborative International Dictionary of English v.0.48:
Geranium \Ge*ra"ni*um\ (j[-e]*r[=a]"n[i^]*[u^]m), n. [L., fr.
Gr. gera`nion, from ge`ranos crane: cf. F. g['e]ranium. See
1. (Bot.) A genus of plants having a beaklike torus or
receptacle, around which the seed capsules are arranged,
and membranous projections, or stipules, at the joints.
Most of the species have showy flowers and a pungent odor.
Called sometimes crane's-bill.
2. (Floriculture) A cultivated pelargonium.
Note: Many plants referred to the genus Geranium by the
earlier botanists are now separated from it under the
name of Pelargonium, which includes all the commonly
cultivated "geraniums", mostly natives of South Africa.
WordNet (r) 3.0 (2006):
n 1: any of numerous plants of the family Geraniaceae