noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A characteristic fern-like pattern on a slide viewed under low power on a microscope, used as a sign when testing for ovulation or the presence of amniotic fluid. uncountable

Etymology

From fern + -ing.

Related phrases

amniotic fluid

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.