Meaning of casing nail

cas'ing nail"

Pronunciation: [key]
  1. a nail having a small, conical head, slenderer than a common nail of the same length, used for laying floors, fastening matchboarding, and other work in which the head may remain visible. Cf. finishing nail.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.