*adar*

‖n. [ L. adarce, adarca, Gr. &unr_;. ] A saltish concretion on reeds and grass in marshy grounds in Galatia. It is soft and porous, and was formerly used for cleansing the skin from freckles and tetters, and also in leprosy. Dana. [ 1913 Webster ]

{ } a. [ L. hebdomadalis, LL. hebdomadarius: cf. F. hebdomadaire. ] Consisting of seven days, or occurring at intervals of seven days; weekly. [ 1913 Webster ]

n. [ LL. hebdomadarius: cf. F. hebdomadier. ] (R. C. Ch.) A member of a chapter or convent, whose week it is to officiate in the choir, and perform other services, which, on extraordinary occasions, are performed by the superiors. [ 1913 Webster ]

‖n. Same as Jemidar. [ 1913 Webster ]

‖n. pl. [ NL. See Monad. ] (Zool.) The Infusoria. [ 1913 Webster ]

n. [ Etymol. uncertain. ] Groats; coarse flour or meal. [ Obs. ] Sir. H. Wotton. [ 1913 Webster ]

n. [ acronym from RAdio Detection And Ranging. ] 1. An electronic device designed to detect objects at a distance, and determine their distance from the device, by transmitting a pulse of radio waves and measuring the time required for the echo of the pulse to return to the emitting device; as, the radar showed a plane approaching rapidly. For more information of radar, see the article What is Radar?. [ acronym ] [ PJC ]

2. The method of detecting objects, finding their distance, or determining their speed, by use of a radar{ 1 } device; as, modern radar can detect objects as small as raindrops. [ PJC ]