n. A plant of the genus Geranium.n. [capitalized] A genus of herbaceous plants (rarely undershrubs), the type of the order Geraniaceæ, distinguished by opposite lobed leaves, regular flowers, and five one-seeded carpels which separate elastically from the axis at maturity, the styles forming long tails which become revolute or spirally twisted.n. A plant of the genus Pelargonium, of South Africa, of which many varieties are common in house-culture and gardens under the names of scarlet geranium, rose geranium, etc.n. One of ⋅everal plants of other genera.n. An impure magenta which contains phosphene.