a. (Chem.) Pertaining to, or designating, an organic acid (called also nonoic acid) found in the leaves of the geranium (Pelargonium) and allied plants. [ 1913 Webster ]

‖prop. n. [ NL., fr. Gr. pelargo`s a stork. ] (Bot.) A large genus of plants of the order Geraniaceæ, differing from Geranium in having a spurred calyx and an irregular corolla. [ 1913 Webster ]

☞ About one hundred and seventy species are known, nearly all of them natives of South Africa, and many having very beautiful blossoms. See the Note under Geranium. [ 1913 Webster ]