Lacking a stomach or belly; used in zoology to describe organisms without a distinct stomach chamber.
From Greek 'a-' (without) plus 'gastēr' (stomach), literally 'without-stomach.' Used in scientific contexts to classify organisms.
Some sea creatures like many cnidarians don't have a stomach in the way humans do—they're 'agastric,' and scientists use this prefix pattern ('a-' for 'without') constantly to describe absence of body parts.
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