Word: proestrus
Part of speech: Noun
Syllables: pro
es
trus
Definition: A phase of the oestrus cycle, prior to sexual receptivity, during which one or more follicles of the ovary begin to grow.
Morphemes:
Affix: pro-
Language: en
PoS: Prefix
Meaning: earlier; prior
Affix: estrus
Language: en
PoS: Noun
Meaning: Alternative form of oestrus; type genus of the Oestridae: sheep botflies