noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   An arrangement or distribution of things into zones. countable, uncountable
2. 2
   The formation of a hollow sphere by the nucleus in metaphase, with a film of granulated protoplasm that marks the boundary of the compound oosphere in Cystopus bliti. countable, uncountable

Etymology

From zone + -ation.