02319 Cor"al*lin (?), n. [So named in allusion to the color of red corallin, fr. L. corallum coral.] (Chem.) A yellow coal-tar dyestuff which probably consists chiefly of rosolic acid. See Aurin, and Rosolic acid under Rosolic.Red corallin, a red dyestuff which is obtained by treating aurin or rosolic acid with ammonia; -- called also altname p\'91onin /altname . -- Yellow corallin. See Aurin.
02311 Con"tact (?), n. [L. contactus, fr. contingere, -tactum, to touch on all sides. See Contingent.] 1. A close union or junction of bodies; a touching or meeting.2. (Geom.) The property of two curves, or surfaces, which meet, and at the point of meeting have a common direction.3. (Mining) The plane between two adjacent bodies of dissimilar rock.Raymond.Contact level, a delicate level so pivoted as to tilt when two parts of a measuring apparatus come into contact with each other; -- used in precise determinations of lengths and in the accurate graduation of instruments.
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