18-letter words containing a, u, t, o, n, i
- united nations day — the anniversary of the United Nations on October 24, marking its founding in 1945.
- unix international — (body) (UI) A consortium including Sun, AT&T and others formed to promote an open environment based on Unix System V, including the Open Look windowing system.
- upper partial tone — overtone (def 1).
- urban homesteading — homesteading (def 2).
- vanadium pentoxide — a yellow to red crystalline compound, V 2 O 5 , slightly soluble in water, used as a catalyst for organic reactions, in glass to absorb ultraviolet radiation, and as a photographic developer.
- veterinary surgeon — Chiefly British. a veterinarian.
- victor emmanuel ii — 1820–78, king of Sardinia 1849–78; first king of Italy 1861–78.
- voluntary abortion — abortion (def 1).
- voluntary-abortion — Also called voluntary abortion. the removal of an embryo or fetus from the uterus in order to end a pregnancy.
- vosges (mountains) — mountain range in NE France, west of the Rhine: highest peak, c. 4,700 ft (1,433 m)
- westinghouse brake — a railroad air brake operated by compressed air.
- widemouth blindcat — any of several catfishes, as Satan eurystomus (widemouth blindcat) of Texas, that inhabit underground streams and have undeveloped eyes and unpigmented skin.
- without hesitation — immediately, willingly
- without obligation — In advertisements, if a product or a service is available without obligation, you do not have to pay for that product or service until you have tried it and are satisfied with it.
- women at point sur — a narrative poem (1927) by Robinson Jeffers.
- wrangell mountains — a mountain range in SE Alaska, extending into the Yukon, Canada. Highest peak: Mount Blackburn, 5037 m (16 523 ft)
- young conservative — a member of the youth section of the United Kingdom Conservative Party
- zone of saturation — the ground below the water table