phytochromePronunciation: /ˈfʌɪtəkrəʊm/Definition of phytochrome noun [mass noun] Biochemistry a blue-green pigment found in many plants, in which it regulates various developmental processes. Origin: late 19th century: from phyto- 'relating to plants' + Greek khrōma 'colour'phytochrome in other Oxford dictionaries Definition of phytochrome in the US English dictionary
