Definition of oosperm in English:

oosperm

Pronunciation /ˈəʊə(ʊ)spəːm/

noun

(also oösperm)
rare Zoology
  • A fertilized ovum.

Origin

Late 19th century; earliest use found in Thomas Huxley (1825–1895), biologist and science educationist. From oo- + -sperm.