HAMMERER
Ham"mer*er, n.
Defn: One who works with a hammer.
HAMMER-HARDEN
Ham"mer-hard`en, v. t.
Defn: To harden, as a metal, by hammering it in the cold state.
HAMMERHEAD
Ham"mer*head`, n.
1. (Zoöl.)
Defn: A shark of the genus Sphyrna or Zygæna, having the eyes set on projections from the sides of the head, which gives it a hammer shape. The Sphyrna zygæna is found in the North Atlantic. Called also hammer fish, and balance fish.
2. (Zoöl.)
Defn: A fresh-water fish; the stone-roller.
3. (Zoöl.)