graupel

noun2

1. •
   A precipitation that forms when supercooled droplets of water condense on a snowflake.

   • Is it desirable in giving the falls of hail to draw a distinction between "graupel" and true hail? — 1873
2. •
   A small ball of rime resulting from this process.

   • It is established that graupels and hailstones are cone-shaped with rounded apexes and that they become egg-shaped as a result of growth during descent. — 1951