Wiktionary
n. (context linguistics English) A word, especially a noun in Indo-European linguistics, whose stem ends in /a/.
Usage examples of "a-stem".
A final note: In some cases, forms in -na that were originally participial or adjectival have themselves become A-stem verbs.
If the ending -ië causes a final -a to drop out when it is added to adjectives, it seems very likely that this also happens when it is added to A-stem verbs.
If so, we might have expected to see it in the formation of A-stem aorists as well.
Above we quoted the QL form tyávë as an attested past tense of the verb tyav- "taste", but in the 1915 Lexicon, the verb "taste" is actually given as an A-stem tyava-: It is not a primary verb tyav as it becomes in later sources (QL:49 vs.
As discussed above, A-stems where the final -a is only part of a longer derivational ending (most often -ya or -ta) are much more common.