Adjective:

இருபுறக் குழிவு,

biconcave's Usage Examples:

344) a second fossil bird from the same locality was indicated as Ichthyornis dispar- from the fish-like, biconcave form of its vertebrae.

The first compound miscroscope (discovered probably by the Middelburg lens-grinders, Johann and Zacharias Janssen about 1590) was a combination of a strong biconvex with a still stronger biconcave lens; it had thus, as well as the first telescope, a negative eyepiece.

Labyrinthodonta, with simple biconcave vertebral disks, very slightly pierced by a remnant of the notochord and supporting the loosely articulated neural arch.

Eurycormus), to biconcave centra, and finally to the socket-and-ball condition that prevails at the present day.

biconvex lens in front of the comb then, try the thin biconcave lens.

KoLA77, a hollow) or angulus lunularis, biconcave.

The cervical and thoracic vertebrae seem to be biconcave; the cervical ribs are much reduced and were apparently still movable; the thoracic ribs are devoid of uncinate processes.

Enaliornis, England, vertebrae chiefly biconcave; Hesperornis, North America, vertebrae heterocoelous.

On the other hand the Odontotormae, as exemplified in Ichthyornis, having the primitive biconcave vertebrae, yet possessed the highly specialized feature of teeth in distinct sockets.

Synonyms:

concave, concavo-concave,

Antonyms:

convex, protrusive, gibbose,