[], (Adjective)

Definitions:
- Central in importance; pivotal, seminal.

- Designating Feulgen's method for staining material in the nuclei of cells, or the reaction on which it is based.


Phrases:

Origin:
early 19th century; earliest use found in Samuel Taylor Coleridge (1772–1834), poet, critic, and philosopher. From nucleus + -al. Compare nuclear