19-letter words containing f, y, i
- rural free delivery — former name for rural delivery service. Abbreviation: R.F.D.
- sea of tranquillity — Astronomy. Mare Tranquillitatis.
- secondary infection — an infection resulting from another infection
- self-responsibility — the state or fact of being responsible, answerable, or accountable for something within one's power, control, or management.
- single life annuity — A single life annuity is an annuity where only one life is covered.
- sodium hydrosulfite — a white, crystalline, water-soluble powder, Na 2 S 2 O 4 , used as a reducing agent, especially in dyeing, and as a bleach.
- stanford university — (education) A University in the city of Palo Alto, California, noted for work in computing, especially artificial intelligence. See SAIL.
- superhigh frequency — any frequency between 3000 and 30,000 megahertz. Abbreviation: SHF.
- take my word for it — If you say to someone 'take my word for it', you mean that they should believe you because you are telling the truth.
- the eye of the wind — the direction from which the wind is blowing
- theory of equations — the branch of mathematics dealing with methods of finding the solutions to algebraic equations.
- to have it off/away — To have it off with someone or have it away with someone means to have sex with them.
- ultrahigh frequency — any frequency between 300 and 3000 megahertz. Abbreviation: UHF, uhf.
- valley of the kings — a valley on the west bank of the Nile near the site of Thebes: the necropolis of many of the kings and queens of the 18th and 19th dynasties of ancient Egypt, c1350–c1200 b.c.
- very high frequency — any frequency between 30 and 300 megahertz. Abbreviation: VHF.
- whorfian hypothesis — Sapir-Whorf hypothesis.
- with flying colours — If you pass a test with flying colours, you have done very well in the test.
- yellowtail flounder — a righteyed flounder, Limanda ferruginea, inhabiting waters along the Atlantic coast of North America, having a yellowish tail fin and rusty-red spots on the body: once commercially important, now greatly reduced in number.
- yellowtail kingfish — a large carangid game fish, Seriola grandis, of S Australian waters