Is the ending -ete or -ate?
schwaEmarginate has one stressed syllable, MAR, and four unstressed ones. Those four vowels are all reduced in speech and all guessable in writing.
heard asemarginete
spelledemarginate
saidee-MAR-jin-ut
-ate. emarginate.
The two endings sound identical once they are unstressed, and English keeps both: obsolete, complete, delete on one side, ornate, sedate, emarginate on the other. Botanical shape adjectives come from the Latin -atus, so they always take the a.
Nearby in the file
emargenate emarginat emerginate emarrginate emarginute emarjinate
The rest are on the word page. All 11 spellings of emarginate.