HAMMER n.
- Hammer hardening, the process of hardening metal by hammering it when cold. -- Hammer shell (Zoöl.), any species of Malleus, a genus of marine bivalve shells, allied to the pearl oysters, having the wings narrow and elongated, so as to give them a hammer-shaped outline; -- called also hammer oyster. -- To bring to…
HARD a.
shade. Hard cancer, Hard case, etc. See under Cancer, Case, etc. -- Hard clam, or Hard-shelled clam (Zoöl.), the guahog. -- Hard coal, anthracite, as distinguished from bituminous or soft coal. -- Hard and fast. (Naut.) See under Fast. -- Hard finish (Arch.), a smooth finishing coat of hard fine plaster applied to…
HEDGEHOG n.
istles. The hedgehog rats belong to Capromys, Plagiodon, and allied genera. -- Hedgehog shell (Zoöl.), any spinose, marine, univalve shell of the genus Murex. -- Hedgehog thistle (Bot.), a plant of the Cactus family, globular in form, and covered with spines (Echinocactus). -- Sea hedgehog. See Diodon.…
HORN n.
ken pox. -- Horn quicksilver (Min.), native calomel, or bichloride of mercury. -- Horn shell (Zoöl.), any long, sharp, spiral, gastropod shell, of the genus Cerithium, and allied genera. -- Horn silver (Min.), cerargyrite. -- Horn slate, a gray, siliceous stone. -- To haul in one's horns, to withdraw some arrogant…