Might mean (unverified): Embryonic mouth forms before anus.
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We found one dictionary that defines the word protostomian:

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  1. protostomian: Wiktionary

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Definitions from Wiktionary (protostomian)

▸ adjective:  Of or pertaining to the protostomes
▸ noun:  A protostome

Similar:
protostomous, protostomic, protostomal, protostelic, stomodeal, protosomal, deuterostomian, prostomial, stomatopodous, stomal, more...

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Similar:
protostomous, protostomic, protostomal, protostelic, stomodeal, protosomal, deuterostomian, prostomial, stomatopodous, stomal, more...



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