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The middle layer of a pericarp which consists of three distinct or dissimilar layers. Gray.

Of or pertaining to, or in the region of, the middle of the head; as, the mesocephalic flexure.

A process from the middle of the coracoid in some animals.

The middle body layer in some invertebrates.

Of or pertaining to the middle region of the abdomen, or of the stomach.

Having the intrinsic muscles of the larynx attached to the middle of the semirings.

Of or pertaining to the middle portion of the nasal region.

The middle one of the three pairs of embryonic renal organs developed in most vertebrates; the Wolffian body.

The middle bark of a tree; the green layer of bark, usually soon covered by the outer or corky layer, and obliterated.

The middle portion of the foot in the Gastropoda and Pteropoda.

The middle one of the three principal basal cartilages in the fins of fishes. -- Me*sop`ter*yg"i*al, a.

A process from the middle of the scapula in some animals; the spine of the scapula.

The scutum or dorsal plate of the middle thoracic segment of an insect. See Illust. of Butterfly.

The middle portion, or body, of the sternum.

The middle layer of the gonophore in the Hydrozoa.

The middle segment of the thorax in insects. See Illust. of Coleoptera.

Having the middle of the body surrounded by bands of cilia; -- said of the larvæ of certain marine annelids.

A middle degree of relief in figures, between high and low relief.

Denoting the middle part; as, in mid ocean. No more the mounting larks, while Daphne sings, Shall list'ning in mid air suspend their wings. Pope.

The middle part of the sea or ocean. Milton. The Mid-sea, the Mediterranean Sea. [Obs.]