Entry 1 sense Webster, 1913 Heliochromic /(hē`lĭ*ō̇*krō"mĭk [or] hē`lĭ*ō̇*krŏm"ĭk)/ · He·li·o·chro·mic · IPA 01 a. Pertaining to, or produced by, heliochromy. 1. Pertaining to, or produced by, heliochromy.