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From The Collaborative International Dictionary of English v.0.48:
Calendula \Ca*len"du*la\, n. [NL., fr. L. calendae calends.] (Bot.) A genus of composite herbaceous plants. One species, Calendula officinalis, is the common marigold, and was supposed to blossom on the calends of every month, whence the name. [1913 Webster]