The Collaborative International Dictionary of English v.0.48:
Feather-edge \Feath"er-edge`\, n. 1. (Zool.) The thin, new growth around the edge of a shell, of an oyster. [1913 Webster] 2. Any thin, as on a board or a razor. [1913 Webster]WordNet (r) 3.0 (2006):
featheredge n 1: a thin tapering edge