Akademik

thematic vowel
noun
a vowel that ends a stem and precedes an inflection
Syn: ↑stem vowel
Hypernyms: ↑vowel, ↑vowel sound

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noun
: a vowel ending the stem of a noun or verb but not belonging to the root; especially : the varying e:o (as in Latin nominative servos, vocative serve slave) — compare grade 4

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thematic vowel,
a vowel occurring between the root and the inflectional ending of a verb or noun in some Indo-European languages.

Useful english dictionary. 2012.