1. Relating to the moon or to a month. 2. Resembling the moon in shape, especially a half moon. SYN: lunate (1) [TA], semilunar. SEE ALSO: crescentic. 3. Relating to silver (the moon was the symbol of silver in alchemy). [L. luna, moon]
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lu·nar (looґnər) [L. luna moon; in alchemy, silver, for which the moon was the symbol] pertaining to or containing silver, as lunar caustic (silver nitrate).Medical dictionary. 2011.