acrania

[ ā-krā′nē-ə, ə-krā′- ]

n.

Congenital absence of all or a part of the skull.

Nearby words

antithetical, antithrombin, antithrombotic, antitorque rotor, antitoxic, acrania, antitoxin unit, antitrade, antitrades, antitragus, antitranspirant

Related forms

a•cra′ni•al adj.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Examples from the Web for acrania

The skull-less animal lancelet, which is still living, affords a faint idea of the members of this group (acrania).
Was Man Created?|Henry A. Mott
Hence we may call it after the Acrania as well as after the Tangles.
The History of Creation, Vol. II (of 2)|Ernst Haeckel
It is absent as a distinct gland in the Acrania and Cyclostomata.
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8|Various