What does "razor" mean?

Razor: 2. (Zoöl.) A task of a wild boar. Razor fish. (Zoöl.) (a) A small Mediterranean fish (Coryphæna novacula), prized for the table. (b) The razor shell. -- Razor grass (Bot.), a West Indian plant (Scleria scindens), the triangular stem and the leaves of which are edged with minute sharp teeth. -- Razor grinder (Zoöl.), the European goat-sucker. -- Razor shell (Zoöl.), any marine bivalve shell belonging to Solen and allied genera, especially Solen, or Ensatella, ensis, and Americana, which have a long, narrow, somewhat curved shell, resembling a razor handle in shape. Called also rasor clam, razor fish, knife handle. -- Razor stone. Same as Novaculite. -- Razor strap, or razor strop, a strap or strop used in sharpening razors.