Defn: 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.
ZYGOMA Zy*go"ma, n. Etym: [NL., fr. Gr. (Anat.) (a) The jugal, malar, or cheek bone. (b) The zygomatic process of the temporal bone. (c) The whole zygomatic arch.
ZYGOMATIC
Zyg`o*mat"ic, a. Etym: [Cf. F. zygomatique.] (Anat.)
Defn: 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 skull, as in some reptiles. — Zygomatic process, a process of the temporal or squamosal bone helping to form the zygomatic arch.
ZYGOMORPHIC; ZYGOMORPHOUS
Zyg`o*mor"phic, Zyg`o*mor"phous, a. Etym: [Gr. (Biol.)
Defn: Symmetrical bilaterally; — said of organisms, or parts of organisms, capable of division into two symmetrical halves only in a single plane.
ZYGOPHYTE
Zy"go*phyte, n. Etym: [Gr. (Bot.)
Defn: 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.
ZYGOSIS
Zy*go"sis, n. Etym: [NL., fr. Gr. (Biol.)
Defn: Same as Conjugation.