| FIS | a drilling bit with cutting edges usually hardened against wear |
|---|---|
| FIS | attractive East Indian palm having distinctive bipinnate foliage |
| FIS | someone who sells fish |
| FIS | terrestrial worm that burrows into and helps aerate soil |
| FIS | (informal) not as expected |
| FIS | capable of being split or cleft or divided in the direction of the grain |
| FIS | (physics) capable of undergoing nuclear fission |
| FIS | a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy |
| FIS | reproduction of some unicellular organisms by division of the cell into two more or less equal parts |
| FIS | a nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element (uranium 235 or plutonium 239)) |
| FIS | (physics) capable of undergoing nuclear fission |
| FIS | (biology) reproducing by fission |