CALENDULA
calendula
(noun) any of numerous chiefly annual herbs of the genus Calendula widely cultivated for their yellow or orange flowers; often used for medicinal and culinary purposes
Source: WordNet® 3.1
Etymology
Noun
calendula (plural calendulas)
Any plant of the genus Calendula, with yellow or orange flowers, often called marigolds.
Source: Wiktionary
Ca*len"du*la, n. Etym: [NL., fr. L. calendae calends.] (Bot.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition