Definition of microgametophyte in US English:

microgametophyte

noun

Botany
  • A gametophyte that develops from a microspore; a male gametophyte.

Origin

Early 20th century; earliest use found in American Naturalist. From micro- + gametophyte, after microgamete.

Pronunciation

microgametophyte

/ˌmʌɪkrə(ʊ)ɡaˈmiːtə(ʊ)fʌɪt/