noun
or pyk·no·sis pikˈnōsə̇s
( -es )
Etymology: New Latin, from Greek pyknōsis condensation, from pyknoun to condense (from pyknos dense, thick) + -ōsis -osis — more at pycn-
: a degenerative condition of a cell nucleus marked by clumping of the chromosomes, hyperchromatism, and shrinking of the nucleus