Submitted by György Chityil ... on Fri, 01/19/2018 - 23:54 Hierarchy: NounDescription: {{biology}} The entrainment of an organism's circadian rhythm to the pattern of light and dark in its environmentNgram: photoentrainmentNgram Text: photoentrainmentSource: WiktionaryIssue: 0Wiktionary tag: biologyNgram Count: 1