18-letter words containing p, o, t, s, f, r
- shatterproof glass — glass designed to resist shattering
- shoot from the hip — the act of shooting with a bow, firearm, etc.
- software backplane — (programming, tool) A CASE framework from Atherton.
- sonic depth finder — a sonar instrument that uses echolocation to measure depths under water.
- spectrofluorimeter — an instrument in which the spectrum of secondarily emitted fluorescent light is used to identify chemical compounds.
- spectrofluorometer — 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
- spotted flycatcher — a European woodland songbird, Muscicapa striata, with a greyish-brown streaked plumage: family Muscicapidae (Old World flycatchers)
- spur-of-the-moment — occurring or done without advance preparation or deliberation; extemporaneous; unplanned: a spur-of-the-moment decision.
- take the wraps off — to reveal
- 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.