fluke
- n a stroke of luck
- n a barb on a harpoon or arrow
- n flat bladelike projection on the arm of an anchor
- n either of the two lobes of the tail of a cetacean
- n parasitic flatworms having external suckers for attaching to a host
flume
- n a narrow gorge with a stream running through it
- n watercourse that consists of an open artificial chute filled with water for power or for carrying logs
flummery
- n a bland custard or pudding especially of oatmeal
- n meaningless ceremonies and flattery
flunitrazepan
- n a depressant and tranquilizer (trade name Rohypnol) often used in the commission of sexual assault; legally available in Europe and Mexico and Colombia
flunk
- n failure to reach a minimum required performance
he got two flunks on his report - v fail to get a passing grade
flunkey
- n a male servant (especially a footman)
- n a person of unquestioning obedience
flunky
- n a male servant (especially a footman)
- n a person of unquestioning obedience
fluor
- n a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine