| 单词 | caseharden |
| 释义 | caseharden in American English (ˈkeɪsˌhɑrdən) verb transitive 1. Metallurgy to form a hard, thin surface on (an iron alloy) 2. to make callous or unfeeling Derived forms casehardened (ˈcaseˌhardened) adjective caseharden in American English (ˈkeisˌhɑːrdn) transitive verb 1. Metallurgy to make the outside surface of (an alloy having an iron base) hard by carburizing and heat treatment, leaving the interior tough and ductile 2. to harden in spirit so as to render insensible or insensitive to external impressions or influences; make callous Word origin [1670–80; case2 + harden]This word is first recorded in the period 1670–80. Other words that entered Englishat around the same time include: generic, guarantee, kink, plan, saber |
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