Definitions

from The Century Dictionary.

  • noun A small genus of widely distributed phæosporous algæ, of the order Dictyotaceæ, having a more or less fan-shaped frond obscurely marked with concentric zones, and roundish or linear sori formed beneath the cuticle of the frond.
  • noun One of two primary groups (the other being Discoidea) into which Huxley divided the deciduate Mammalia, consisting of those Deciduata which have a zonary placenta; the Zonoplacentalia.

from the GNU version of the Collaborative International Dictionary of English.

  • noun plural (Zoöl.) A division of Mammalia in which the placenta is zonelike.

Etymologies

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