Etymology
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rosemary (n.)

evergreen shrub native to southern Europe and widely cultivated for its fragrance, late 14c., rose-marie, earlier rosmarine (c. 1300), from Latin rosmarinus, literally "dew of the sea" (compare French romarin), from ros "dew" + marinus "of the sea, maritime," from mare "sea, the sea, seawater" (from PIE root *mori- "body of water").

Perhaps it was so called because it grew near coasts. The form was altered in English by influence of unrelated rose and Mary.

Latin ros is from a PIE noun probably from *ers- "to be wet" (source also of Lithuanian rasa, Old Church Slavonic rosa "dew," Sanskrit rasah "sap, juice, fluid, essence," Hittite arszi "flows," and perhaps also Rha, Scythian name of the River Volga (see rhubarb)).

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Definitions of rosemary

rosemary (n.)
widely cultivated for its fragrant grey-green leaves used in cooking and in perfumery;
Synonyms: Rosmarinus officinalis
rosemary (n.)
extremely pungent leaves used fresh or dried as seasoning for especially meats;
From wordnet.princeton.edu