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| iron; ironclad; adamant; adamantine; steely | |||
| ferrous | |||
| indomitable; staunch | |||
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| vise-like; viselike | |||
| vice-like; vicelike | |||
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| cast-iron | |||
|
eiserner : 108 phrases in 23 subjects |
| Alternative dispute resolution | 3 |
| American usage, not spelling | 1 |
| British usage, not spelling | 1 |
| Business | 1 |
| Construction | 10 |
| Cultural studies | 1 |
| Economics | 3 |
| General | 24 |
| Health care | 2 |
| Industry | 1 |
| Life sciences | 2 |
| Materials science | 2 |
| Medical | 5 |
| Medical appliances | 1 |
| Metallurgy | 13 |
| Mining | 13 |
| Municipal planning | 1 |
| Nuclear physics | 1 |
| Politics | 2 |
| Sample preparation | 1 |
| Slang | 1 |
| Technology | 2 |
| Transport | 17 |