non-combustible en · ADJ
Etymology
From non- + combustible
Meanings
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(alt-of, alternative, not-comparable) Alternative form of noncombustible.
alt of noncombustible
Although the subway structure is of non-combustible material, a fire protection system, with fire hose cabinets on every underground platform, has been provided.
1954 June, “Yonge Street Subway, Toronto”, in Railway Magazine, page 422: