Definify.com

Webster 1913 Edition

Acrania

‖

A-cra′ni-a

,
Noun.
[NL., from Gr.
ἀ
priv. + [GREEK] skull.]
1.
(Physiol.)
Partial or total absence of the skull.
2.
pl.
(Zool.)
The lowest group of Vertebrata, including the amphioxus, in which no skull exists.

Similar Results