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The zygodactylous birds. In a restricted sense applied to a division of birds which includes the barbets, toucans, honey guides, and other related birds.

Same as Scansores.

Yoke-footed; having the toes disposed in pairs; -- applied to birds which have two toes before and two behind, as the parrot, cuckoo, woodpecker, etc.

The zygomatic process of the temporal bone.

Of, pertaining to, or in the region of, the zygoma. Zygomatic arch, the arch of bone beneath the orbit, formed in most mammals by the union of the malar, or jugal, with the zygomatic process of the temporal bone. In the lower vertebrates other bones may help to form it, and there may be two arches on each side of the s…

Symmetrical bilaterally; -- said of organisms, or parts of organisms, capable of division into two symmetrical halves only in a single plane.

Any plant of a proposed class or grand division (Zygophytes, Zygophyta, or Zygosporeæ), in which reproduction consists in the union of two similar cells. Cf. Oöphyte.

Same as Conjugation.

the contents of two similar cells, either of the same or of distinct individual plants. Zygosperms are found in certain orders of algæ and fungi.

A median process on the front part of the neural arch of the vertebræ of most snakes and some lizards, which fits into a fossa, called the zygantrum, on the back part of the arch in front.

Same as Zygosperm.

The common bistort or snakeweed (Polygonum bistorta).

Alternate. -- Angle bar. (a) (Carp.) An upright bar at the angle where two faces of a polygonal or bay window meet. Knight. (b) (Mach.) Same as Angle iron. -- Angle bead (Arch.), a bead worked on or fixed to the angle of any architectural work, esp. for protecting an angle of a wall. -- Angle brace, Angle tie (Carp.…

Grown old. Hence: Bygone; obsolete; out of use; old-fashioned; as, an antiquated law. "Antiquated words." Dryden. Old Janet, for so he understood his antiquated attendant was denominated. Sir W. Scott.

The perpendicular from the center to one of the sides of a regular polygon.

A projecting part of a building, esp. of a church, having in the plan a polygonal or semicircular termination, and, most often, projecting from the east end. In early churches the Eastern apse was occupied by seats for the bishop and clergy. Hence:

Already past or gone; bygone. [R.] And flies unconscious o'er each backward year. Byron.

In early times, a separate building, usually polygonal, used for baptismal services. Small churches were often changed into baptisteries when larger churches were built near.

The exterior side of the polygon, or that imaginary line which connects the salient angles of two adjacent bastions.

ay or recess in a room, and projecting outward from the wall, either in a rectangular, polygonal, or semicircular form; -- often corruptly called a bow window.