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a combining form meaning “dense,” “close,” “thick,” used in the formation of compound words:
Also, especially before a vowel, pycn-.
Origin of pycno-
< New Latin, combining form representing Greek pyknós Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for pycno-


combining form
indicating thickness or density: pycnometer
Word Origin
via New Latin from Greek puknos thick
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for pycno-

before vowels pycn-, word-forming element meaning "close, thick, dense," from comb. form of Greek pyknos "thick, dense." Sometimes via German as pykno-.

Online Etymology Dictionary, © 2010 Douglas Harper
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