In zoology, referring to organisms without a disk-like mouth structure or lacking disk-shaped mouth parts.
From dis- + costo- (relating to ribs or disk-like structures) + -matous (from Greek stoma, 'mouth'). This is a technical biological term describing mouth structure.
This word is so specialized that only marine biologists studying ancient organisms or specific invertebrate groups would ever use it—it's the kind of word that exists purely for scientific precision!
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