chlorophyl n any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms Usage(s) The word is chlorophyll, the substance that makes plant life green. Why reeks the goatOn yonder hill Who seems to doteOn chlorophyll?Whether or not chlorophyll and related compounds get. Green and red are the colors of life: green for the chlorophyll in plants, red for the hemoglobin in blood cells of man and animal. Synonym(s) chlorophyll