18-letter words containing a, c, r, i, d, s
- triphosphoric acid — the hypothetical acid H 5 P 3 O 10 , known chiefly by its salts.
- ultrasonic welding — the use of high-energy vibration of ultrasonic frequency to produce a weld between two components which are held in close contact
- under-compensation — to compensate or pay less than is fair, customary, or expected.
- upper middle class — wealthy, highly-educated people
- 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
- 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.
- wildlife sanctuary — an area where wild animals and plants are protected
- world championship — an international competition in a particular sport or activity for people all around the world