1. (Science: botany) a genus of plants having a beaklike tours 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 odour. Called sometimes crane's-bill.
2. (Science: botany) a cultivated pelargonium.
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.