ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: so called from its growing in clusters
1. : a large typically globose citrus fruit with a bitter yellow rind and inner skin and a highly flavored somewhat acid juicy pulp varying in color from pale yellow to deep reddish pink — called also pomelo
2. also grapefruit tree : a small roundheaded tree ( Citrus paradisi ) that produces grapefruit, is probably derived from the shaddock from which it differs chiefly in fruit characters, glabrous leaves and twigs, clustered growth of flowers and fruits, and solidity of the plant axis, and is widely cultivated in subtropical areas