POACHARD n. 2 definitions
The American redhead, which is closely allied to the European poachard. Red-crested poachard (Zoöl.), an Old World duck (Branta rufina). -- Scaup poachard, the scaup duck. -- Tufted poachard, a scaup duck (Aythya, or Fuligula cristata), native of Europe and Asia.
SELF-HARDENING a.
Designating, or pert. to, any of various steels that harden when heated to above a red heat and cooled in air, usually in a blast of cold air with moderate rapidity, without quenching. Such steels are alloys of iron and carbon with manganese, tungsten and manganese, chromium, molybdenum and manganese, etc. They are chi…