18-letter words containing d, i, e, l, r, n
- tranquillizer dart — a dart filled with a tranquillizer that is shot from a gun in order to temporarily sedate an animal so that it may be handled safely
- transit theodolite — a theodolite having a telescope that can be transited.
- triarylmethane dye — any of the class of dyes containing three aryl groups attached to a central carbon atom: used chiefly for dyeing cotton, wool, and silk.
- tristan und isolde — a music drama (composed, 1857–59; première, 1865) by Richard Wagner.
- trobriand islander — a native or inhabitant of the Trobriand Islands of Papua New Guinea
- ultrasonic welding — the use of high-energy vibration of ultrasonic frequency to produce a weld between two components which are held in close contact
- universal debugger — (tool, parallel) (udb) KSR's interactive source level debugger for serial and parallel programs written in KSR, Fortran, KSR C and KSR1 assembly language. Udb is a source level debugger for testing and debugging serial and parallel programs; it is compatible with GDB and dbx. The user can direct udb either by typing commands or graphically through an X-based window interface; the latter provides simultaneous display of source code, I/O and instructions. For parallel programs, operations can be carried out per-thread.
- video surveillance — a system of monitoring activity in an area or building using a television system in which signals are transmitted from a television camera to the receivers by cables or telephone links forming a closed circuit
- wandering minstrel — travelling performer
- watson-crick model — a widely accepted model for the three-dimensional structure of DNA, featuring a double-helix configuration for the molecule's two hydrogen-bonded complementary polynucleotide strands.
- welwyn garden city — a town in SE England, in Hertfordshire: established (1920) as a planned industrial and residential community. Pop: 43 512 (2001)
- wild passionflower — the maypop, Passiflora incarnata.
- wildlife sanctuary — an area where wild animals and plants are protected
- winged everlasting — a bushy composite plant, Ammobium alatum, of Australia, having winged branches, javelin-shaped leaves, and white flowers.
- xenon hexafluoride — a colorless, crystalline compound, XeF 6 , that melts at 50°C to a yellow liquid, and boils at 75°C.