American Dictionary of the English Language

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TOUGHNESS, noun tuf'ness. The quality of a substance which renders it in some degree flexible, without brittleness or liability to fracture; flexibility with a firm adhesion of parts; as the toughness of steel.

1. Viscosity; tenacity; clamminess; glutinousness; as the toughness of mucus.

2. Firmness; strength of constitution or texture.