Definition of pyknosis in US English:

pyknosis

(also pycnosis)

noun

Biology
  • Reduction in size and increase in staining of a cell or (more commonly) its nucleus, usually indicating degeneration or necrosis; an instance of this.

Origin

Early 20th century. From ancient Greek πύκνωσις condensation, condensed matter (from πυκνοῦν to make dense or solid (from πυκνός dense, closely packed: see pycno-) + -ωσις), after German Pyknose.

Pronunciation

pyknosis

/pɪkˈnəʊsɪs/