a combining form meaning “male,” used in the formation of compound words: androsterone.
Also, andr-.

< Greek andró(s), genitive of anḗr man; akin to Sanskrit nar-, Albanian njerí person, Latin Nero Nero Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
andro- or (before a vowel) andr-
combining form
1.  male; masculine: androsterone
2.  (in botany) stamen or anther: androecium
[from Greek anēr (genitive andros) man]
andr- or (before a vowel) andr-
combining form
[from Greek anēr (genitive andros) man]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

from Gk. andro-, comb. form of aner (gen. andros) "man, male" (see anthropo-).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

andro- or andr-
Male; masculine: androgen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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