The Collaborative International Dictionary of English v.0.48:
Citroncirus \Citroncirus\ n. a cross between Citrus sinensis and Poncirus trifoliata. Syn: genus Citroncirus. [WordNet 1.5]WordNet (r) 3.0 (2006):
Citrus sinensis n 1: probably native to southern China; widely cultivated as source of table and juice oranges [syn: sweet orange, sweet orange tree, Citrus sinensis]