a. (erron. costæform.) [mod. f. L. costa rib: see -FORM.] Having the form of a rib or costa; rib-like. (See COSTA.)
1852–9. Todd, Cycl. Anat., IV. 672/2. The vertebriform iliac bones become joined to the costiform pubic.
1857. Berkeley, Cryptog. Bot., § 599. The absence of costæform veins and free veinlets distinguishes it.
