Biol. [f. as if from a vb. *cephalize (f. Gr. κεφαλή + -IZE) + -ATION: cf. specialization.] A term introduced by Dana to express the degree to which the head is developed and dominates over the rest of the body.
1864. Q. Jrnl. Sc., I. 523. Mr. James D. Dana has continued the publication of his memoir on the classification of animals, based on the principle of Cephalization.
1880. Libr. Univ. Knowl., III. 632. Degrees of cephalization may be illustrated by the subdivisions of the mammalia.
So Cephalized a., organized with a head, having the head developed.
1862. Dana, Man. Geol., 596. Cephalized species.
