Heard spelling

macropyle

Spelled micropyle. an unstressed vowel

Macropyle would mean the opposite.

Micro- is small and macro- is large, so a macropyle would be a large gate rather than a small one.

This is the one rendering on the page that changes the meaning rather than just the letters. The opening it names is a few cells across and invisible without a lens, so micro- is doing real work.

Say

MY-kroh-pile

Letters

M-I-C-R-O-P-Y-L-E