crucible /krooˈsi-bl/

1. An earthen pot for melting ores, metals, etc
2. A severe test or trial (figurative)

• customs house
• customs houses
• custom-shrunk
• customs union
• customs unions
• custos
• custos rotulorum
• custrel
• custrels
• custumary
• cusum
• cusums
• cut
• cut a caper
• cut across
• drilling mud
• drilling pipe
• drilling pipes
• drilling platform
• drilling platforms
• drilling rig
• drilling rigs
• drill-master
• drill-masters
• drill-plough