noun
1. mining engineering : a timber set containing an angle brace
2. mining engineering : one of a series of sets making angles with one another (as in a curving shaft or tunnel)
noun
1. mining engineering : a timber set containing an angle brace
2. mining engineering : one of a series of sets making angles with one another (as in a curving shaft or tunnel)
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012