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The body, or axis, of a vertebra. See Vertebra.

The median of the three elements composing the centra of the vertebræ in some fossil batrachians.

One of the lateral elements in the centra of the vertebræ in some fossil batrachians.

Arising from the centrum of a vertebra. Owen.

A process, or other element, of a vertebra developed from the ventral side of the centrum, as hæmal spines, and chevron bones. -- Hy`pa*po*phys"i*al, a.

Cf. Hemal. Neural arch (Anat.), the cartilaginous or bony arch on the dorsal side of the centrum of the vertebra in a segment of the spinal skeleton, usually inclosing a segment of the spinal cord.

Between the neural arch and the centrum of a vertebra; as, the neurocentral suture. Huxley.

ntoid process. -- Odontoid process, or Odontoid peg (Anat.), the anterior process of the centrum of the second vertebra, or axis, in birds and mammals. See Axis.

Concave behind; -- applied especially to vertebræ in which the anterior end of the centrum is convex and the posterior concave.

The ventral part of each side of the neural arch connecting with the centrum of a vertebra.

oice (Diplodus rhomboides). (c) The redmouth, or grunt. (d) A market fish of Bermuda (Holocentrum Ascensione). -- Squirrel grass (Bot.), a pestiferous grass (Hordeum murinum) related to barley. In California the stiffly awned spiklets work into the wool of sheep, and into the throat, flesh, and eyes of animals, someti…