nacreous

[Eng. nacre: -ous.] 1. Ord. Lang.: Consisting of mother-of-pearl; resembling mother-of-pearl. 2. Zool.; A term applied to one of the three principal varieties of shells. Nacreous shells have a 2. In chemistry for the element nitrogen. N. As an initial is used for North as in charts N. by E. North by East; N. B. New Brunswick; for Latin nota , as N. B. = nota bene = mark or note carefully; for notary, as N. P. Notary Public. N. or M .: The most probable explanation of these is that N= Nomen , and that Nomen for one person, or Nomina for several persons, was expre ed by 27, vel NN; the double N being afterward corrupted into M. ( Blunt : Annotated Common Prayer .) na, nãe, adverb. [Scotch & Prov. Eng. for no (q. v.).] No, not. năb, s. [Icel. nabbi a knot; cf. knap, knob , knop , nob .] I. Ordinary Language : 1. The top or summit of a rock or mountain; a rising ground. "Just turn this nab of heath."-E. Bronte: Wuthering Heights, ch. xxi. *2. A hat. tions of the edges of alternate layers of carbonate of lime and membrane. ( Nicholson.)