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The quality or state of being tough.

A cord of great toughness made from the intestines of animals, esp. of sheep, used for strings of musical instruments, etc.

Sinew; strength; toughness; as, a man of real fiber. Yet had no fibers in him, nor no force. Chapman.

Resembling a cord in toughness and flexibility, as the roots of some endogenous trees.

A variety of bronze possessing great hardness, elasticity, and toughness, obtained by melting copper with tin phosphide. It contains one or two per cent of phosphorus and from five to fifteen per cent of tin.

consisting essentially of hornblende and feldspar, useful for flagging on account of its toughness. -- Slate ax or axe, a mattock with an ax end, used in shaping slates for roofs, and making holes in them for the nails. -- Slate clay (Geol.), an indurated clay, forming one of the alternating beds of the coal measure…

Power to resist force; solidity or toughness; the quality of bodies by which they endure the application of force without breaking or yielding; -- in this sense opposed to frangibility; as, the strength of a bone, of a beam, of a wall, a rope, and the like. "The brittle strength of bones." Milton.

A process (invented about 1899 by Frederick W. Taylor and Maunsel B. White) for giving toughness to self-hardening steels. The steel is heated almost to fusion, cooled to a temperature of from 700º to 850º C. in molten lead, further cooled in oil, reheated to between 370º and 670º C., and cooled in air.…

Leather dressed or tawed with alum, salt, etc., remarkable for its pliability and toughness; white leather.