Definition of Melocactus in US English:

Melocactus

noun

  • A genus of Central and South American cacti which are often hemispherical in shape, and prominently ribbed, with the flowers borne on a woolly terminal structure; (also melocactus) a cactus of this genus (also called melon-cactus, melon-thistle, Turk's cap).

Origin

Mid 18th century; earliest use found in Philip Miller (1691–1771), horticulturist and writer. From post-classical Latin melocactus (C. Bauhin Pinax 5) from post-classical Latin melo + cactus.

Pronunciation

Melocactus

/ˌmɛlə(ʊ)ˈkaktəs/