Minim

noun

1. A half note, drawn as a semibreve with a stem.
2. A unit of volume, in the Imperial and U.S. customary systems, 1/60 fluid drachm. Approximately equal to 1 drop, 62 μL or 0.9 grain (weight) of water.
3. A short vertical stroke used in handwriting.
4. Anything very minute; applied to animalcula and the like.

   "the minims of existence"

5. The smallest kind of worker in a leaf-cutter ant colony.