18-letter words containing p, o, u, r, i, l
- super giant slalom — a slalom race in which the course is longer and has more widely spaced gates than in a giant slalom.
- supraorbital ridge — browridge.
- temporal summation — the act or process of summing.
- thiosulphuric acid — an unstable acid known only in solutions and in the form of its salts. Formula: H2S2O3
- to play favourites — to display favouritism
- to spill your guts — if someone spills their guts, they tell you everything about something secret or private
- universal coupling — a coupling between rotating shafts set at an angle to one another, allowing for rotation in three planes.
- upper palaeolithic — the latest of the three periods of the Palaeolithic, beginning about 40 000 bc and ending, in Europe, about 12 000 bc: characterized by the emergence of modern man, Homo sapiens
- upper partial tone — overtone (def 1).