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Webster 1913 Edition

Noun.

[Gr. [GREEK] color + [GREEK] matter.]

(Bot.)

A general name for coloring matter of plants other than chlorophyll, especially that of petals.

chromule ‎(countable and uncountable, plural chromules)

(botany, dated) Any colouring matter in plants other than chlorophyll, and especially in the petals.