Noun
ferning (uncountable)
English Wikipedia has an article on:Fern testWikipedia
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.
During this window, ferning structures occur in cervical mucus as well as saliva. Source: Internet
Saliva microscopes, when correctly used, can detect ferning structures in the saliva that precede ovulation. Source: Internet
Uses infobox Only young asparagus shoots are commonly eaten: once the buds start to open ("ferning out"), the shoots quickly turn woody. citation Water makes up 93% of asparagus's composition. Source: Internet