The pore or opening leading into the cavity of invagination, or archenteron.
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Open English WordNet identifies the related term as a broader lexical category for at least one sense.
A mouth or aperture, as of a tube, pipe, etc.; an opening; as, the orifice of an artery or vein; the orifice of a wound.
Open English WordNet identifies the related term as a broader lexical category for at least one sense.
The part of the liver or other organ where its vessels and nerves enter; the hilus.
Open English WordNet identifies the related term as a broader lexical category for at least one sense.
The primitive enteron or undifferentiated digestive sac of a gastrula or other embryo. See Illust. under Invagination.
Open English WordNet identifies the related term as a containing group, substance or whole.
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