a combining form representing spectrum in compound words: spectrometer.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for spectro-
indicating a spectrumspectrogram
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
Word Origin and History for spectro-
word-forming element meaning "of or by a spectroscope," also "of radiant energy," from comb. form of spectrum.
Online Etymology Dictionary, © 2010 Douglas Harper
Medicine definitions for spectro-
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.