Tractoration :: Tractoration (n.) See Perkinism.

Tractory :: Tractory (n.) A tractrix.

Tractrix :: Tractrix (n.) A curve such that the part of the tangent between the point of tangency and a given straight line is constant; -- so called because it was conceived as described by the motion of one end of a tangent line as the other end was drawn along the given line.

Tricktrack :: Tricktrack (n.) An old game resembling backgammon.

Uptrace :: Uptrace (v. t.) To trace up or out.

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