In zoology, describing an organism or body plan that lacks a complete digestive system or viscera; without internal organs.
From Greek 'a-' (without) + 'splanchna' (viscera, internal organs). This is a technical term combining the Greek negative prefix with the root for body organs.
Some of the strangest creatures on Earth are 'asplanchnic'—certain parasitic worms have completely lost their digestive systems because they live inside hosts where food is already broken down and available.
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