Chromo

From chromolithograph.

Full definition of chromo

(plural chromos)

1870, Various, Punchinello Vol. 1, No. 21, August 20, 1870 Chapter , All Nature is smiling, in fact, with one large, comprehensive smile, exactly like a first-class PRANG chromo with a fresh coat of varnish upon it.
1883, Mark Twain (Samuel Clemens), Life on the Mississippi Chapter , It was manifest that we all felt that we ought to send the poor shoemaker SOMETHING. There was long and thoughtful discussion of this point; and we finally decided to send him a chromo.
1999, February 19, Deanna Isaacs, On Exhibit: a treasure trove of Mexican pop art, The neglected warehouse turned out to be a treasury of calendar art from the 1930s through the 1970s, years when chromo art calendars were a major advertising medium, a vehicle for national pride, and a fixture in nearly every home, business, and school.

(plural chromos)

1970, John Glassco, Memoirs of Montparnasse, New York 2007, p. 81:That dried-up lady snob lived behind lace curtains all her life. She's of no more importance than a chromo.

From chromodomain.

(genetics) Of or relating to the chromodomain, a protein structural domain associated with chromatin production

April 24, HP1 shares an ~50-amino acid NH 2 -terminal sequence motif, the chromo domain, with polycomb, an important regulatory gene that functions in the stable repression of homeotic genes during Drosophila development (28 ).
April 6, To determine whether the conserved domains, the chromo, SET, and cysteine-rich regions, were also critical for Clr4 HMTase activity, we tested mutant Clr4 proteins for HMTase activity.