Lacking a mouth or mouth-like opening; another form of the adjective meaning without a mouth.
From Greek 'a-' (without) + 'stoma' (mouth) + '-ous' (having the quality of). A variant spelling of 'astomatous,' used interchangeably in older medical and biological texts.
English has multiple ways to say the same thing in scientific language—'astomatous' and 'astomous' are basically twins, but only one survived to modern usage.
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