I. (ˈ)āˈkrānēə noun
( -s )
Etymology: New Latin, from a- (II) + -crania
: congenital partial or total absence of the skull
II. noun plural
Usage: capitalized
Etymology: New Latin, from a- (II) + -crania (from Greek kranion skull) — more at cranium
in some classifications : a division of Chordata comprising Hemichordata, Urochordata, and Cephalochorda and including all the chordates without true heads and anterior brains — compare vertebrata
III.
Etymology: New Latin, from a- (II) + -crania (from Greek kranion skull)
synonym of cephalochorda