(uncountable) Meat with no fat on it. / (countable, biology) An organism that is lean in stature.

(astronautics) Abbreviation of specific impulse.

(obsolete) A self-confident person full of braggadocio. / Any of a number of devices that eject a pressurized stream of liquid. / (often science fiction) A vehicle or engine that works by jet propu...

plural of tetraribonucleotide