pheophytin

noun
pheo·​phy·​tin
variants: or British phaeophytin \ ˌfē-​ə-​ˈfīt-​ᵊn \

Medical Definition of pheophytin 

: a bluish black waxy pigment that can be formed from chlorophyll by replacement of the magnesium with two hydrogen atoms by treatment with a weak acid (as oxalic acid)

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