Also pykn(o)‑.
Compact; dense.
Greek puknos, thick.
A pycnocline (Greek klinein, to slope) is a layer in a body of water in which water density increases rapidly with depth; a pycnometer (sometimes pyknometer) measures the relative density of liquids; Pycnogonida (Greek gonu, knee) is a class of marine arthropods, the sea spiders; someone who is pyknic is stocky, with a rounded body and head, thickset trunk, and a tendency to fat; pyknosis is the shrinkage of the nuclear material of a cell into a compact mass, a sign of cell degeneration.
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