18-letter words containing p, o, s, t, f, i
- slip of the tongue — If you describe something you said as a slip of the tongue, you mean that you said it by mistake.
- sodium hyposulfite — sodium thiosulfate.
- sonic depth finder — a sonar instrument that uses echolocation to measure depths under water.
- specific viscosity — a measure of the resistance to flow of a fluid, expressed as the ratio of the absolute viscosity of the fluid to that of a reference fluid (usually water in the case of liquids)
- spectrofluorimeter — an instrument in which the spectrum of secondarily emitted fluorescent light is used to identify chemical compounds.
- spirits of ammonia — a 10% solution of ammonia in alcohol
- stepping-off place — jumping-off place (def 2).
- to play favourites — to display favouritism
- torsion-free group — a group in which every element other than the identity has infinite order.
- visiting professor — a professor from another institution invited to teach at a university or college for a limited period, usually for a semester or one academic year.