20-letter words containing a, m, y, t, l
- self-belaying system — (in climbing) equipment used to pay out rope as required and thus enable a climber to self-belay
- small craft advisory — a U.S. National Weather Service advisory of sustained winds, over coastal and inland waters, with speeds of 20–33 knots (23–38 mph, 10–17 m/sec). Regional NWS offices have discretion over the choice of the lower limit.
- software methodology — (programming) The study of how to navigate through each phase of the software process model (determining data, control, or uses hierarchies, partitioning functions, and allocating requirements) and how to represent phase products (structure charts, stimulus-response threads, and state transition diagrams).
- solitary confinement — the confinement of a prisoner in a cell or other place in which he or she is completely isolated from others.
- supplementary angles — either of two angles that added together produce an angle of 180°.
- system international — Système International d'Unités
- systemic circulation — the circulatory system in general.
- technology agreement — a framework designed by trade unions for negotiating changes in employment caused by the introduction of new technology
- thermal conductivity — the amount of heat per unit time per unit area that can be conducted through a plate of unit thickness of a given material, the faces of the plate differing by one unit of temperature.
- three-dimensionality — having, or seeming to have, the dimension of depth as well as width and height.
- to leave your/a mark — If someone or something leaves their mark or leaves a mark, they have a lasting effect on another person or thing.
- tribromoacetaldehyde — bromal.
- triphenylmethane dye — any of a great number of dyes, as gentian violet, fuchsin, and rosaniline, produced from triphenylmethane by replacement of the ring hydrogen atoms with hydroxy, amino, sulfo, or other atoms or groups.
- upper yosemite falls — a section of Yosemite Falls in central California, in the Yosemite National Park that is 436 m (1430 ft) high
- westminster assembly — a convocation that met at Westminster, London, 1643–49, and formulated the articles of faith (Westminster Confession of Faith) that are accepted as authoritative by most Presbyterian churches.
- what-you-may-call-it — an object or person whose name one does not know or cannot recall.
- winter olympic games — an international contest of winter sports, esp skiing, held every four years