The Collaborative International Dictionary of English v.0.48:

Chunam \Chu*nam"\ (ch[=oo]*n[a^]m"), n. [Hind. ch[=u]n[=a], from
   Skr. c[=u]r[.n]a powder, dust; or a Dravidian word.]
   Quicklime; also, plaster or mortar. [India] --Whitworth.
   [1913 Webster]