IPA: //oʊˈspɜːrm//
KK: /ˈoʊsˌpɜrm/
A female reproductive cell that, after fertilization, can develop into a new organism.
The oosperm is formed when the sperm cell fertilizes the egg cell.
Oosperm is formed from "oo-" (from Greek "oion", meaning egg) and "sperm" (from Greek "sperma", meaning seed). The word refers to the egg cell in the context of reproduction, combining the concepts of egg and seed.
Think of 'egg' ('oo-') and 'seed' ('sperm') coming together to create new life, which helps you remember that 'oosperm' refers to the egg cell in reproduction.