16-letter words containing x, s, t, r
- symmetric matrix — a matrix with the lower-left half equal to the mirror image of the upper-right half; a matrix that is its own transpose.
- texas revolution — a revolutionary movement, 1832–36, in which U.S. settlers asserted their independence from Mexico and established the republic of Texas.
- the sex industry — a commercial sector that employs sex workers in prostitution, pornography, etc.
- triple-expansion — noting a power source, especially a steam engine, using the same fluid at three successive stages of expansion to do work in three or more cylinders.
- twin-lens reflex — See under reflex camera. Abbreviation: TLR.
- world exposition — world's fair.
- xenotransplanted — Transplanted by xenotransplantation.