Medullary shell ellipsoidal (with longitudinal main axis), one-third as broad as the cortical shell.
longitudinal stability is governed by means of the front rudder.
The costae, longitudinal ribs or rows of spines on the outer surface of the theca.
Stripe: a longitudinal streak of color different from the ground.
All longitudinal seams are butt-strapped, inside and outside, and secured by six rows of rivets.
He was lifted to the longitudinal center of the bed and placed on his back.
The latter is the more primitive, and there seems good reason to believe that longitudinal stripes preceded transverse bars.
The dark spots are laid on in a longitudinal series of crescents.
There is, however, a longitudinal groove of more or less depth.
The whole system has, in fact, been changed from the transverse to the longitudinal.
longitudinal lon·gi·tu·di·nal (lŏn'jĭ-tōōd'n-əl, -tyōōd'-)
Running in the direction of the long axis of the body or any of its parts.