Heard spelling

geenoecium

Spelled gynoecium. two changes at once

Does the first syllable rhyme with green?

Dictionaries give that syllable as guy- or jih-, not gee-, but the letter carrying the vowel is y, which invites every vowel in the language.

Whatever the vowel does in the mouth, the letter stays. Upsilon comes into English as y and nothing later changes it.

Say

guy-NEE-see-um, and jy-NEE-see-um is heard just as often

Letters

G-Y-N-O-E-C-I-U-M