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2 definitions found
 for Chlorophyll
From The Collaborative International Dictionary of English v.0.48 :

  Chlorophyll \Chlo"ro*phyll\, n. [Gr. chlwro`s light green +
     fy`llon leaf: cf. F. chlorophylle.]
     1. (Bot.) Literally, leaf green; a green granular matter
        formed in the cells of the leaves (and other parts exposed
        to light) of plants, to which they owe their green color,
        and through which all ordinary assimilation of plant food
        takes place. Similar chlorophyll granules have been found
        in the tissues of the lower animals. [Written also
        chlorophyl.]
        [1913 Webster]
  
     2. any of a group of green pigments found in photosynthetic
        organisms. Chlorophyll a and chlorophyll b are found
        in higher plants and green algae; chlorophyll c is found
        in certain types of marine algae. Chemically, it has a
        porphyrin ring with a magnesium ion bound to the four
        central nitrogens, and has a phytyl side chain. It is
        essential for photosynthesis in most plants. Chlorophyll
        a has formula C55H72N4O5Mg.
  
     Syn: chlorophyll.
          [WordNet 1.5]

From WordNet (r) 3.0 (2006) :

  chlorophyll
      n 1: any of a group of green pigments found in photosynthetic
           organisms; there are four naturally occurring forms [syn:
           chlorophyll, chlorophyl]

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