plural of break-fast

plural of tub-fast

(obsolete) The treatment of venereal disease by sweating in a hot tub.

Moderately fast; often used to describe a train service which doesn't stop at every station.

(Christianity) A Sunday set aside by the Church of Jesus Christ of Latter-day Saints for fasting by its members, and on which a testimony meeting is held by local congregations.

Alternative form of ultrafast

Alternative form of fastgrowing

simple past tense and past participle of fast-track

(video games) The ability to travel instantaneously between previously discovered locations in an open world. / Used other than figuratively or idiomatically: see fast, travel.

(nuclear physics, engineering) A nuclear reactor with no moderator, using fast neutrons directly in a controlled fission chain reaction without slowing them down; this allows for a much more compact reactor, and causes the reactor to use fissile material much more efficiently, and to generate larger quantities of high-energy neutrons which can be used for breeding more fissile material or producing other useful radioactive nuclides, but requires the use of highly-enriched uranium (at least 20% uranium-235) or other fuel containing a similarly high concentration of fissile material.