a. (sb.) Zool. [f. mod.L. Zygobranchiāta pl., f. Gr. ζυγόν yoke + βράγχια gills: see -ATE2.] Belonging to the division Zygobranchiata or Zygobranchia of gastropod molluscs, having paired (right and left) gills or ctenidia; as sb. a mollusc of this division.
1883. Ray Lankester, in Encycl. Brit., XVI. 655/2. The Zygobranchiate Streptoneura.
