1. <physiology> Partial or total absence of the skull.

2. <zoology> The lowest group of Vertebrata, including the amphioxus, in which no skull exists.

Origin: NL, from Gr. Priv. + skull.

(01 Mar 1998)

acquisitus, ACR, acral, acral lentiginous melanoma < Prev | Next > acranial, acranius, acraspeda

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