Radicle or Radicula: that joint of the antenna that is articulated to the head.
Give the etymologies of the words icicle, radicle, and radical.
The -icle, in icicle, is apparently the same as the -icle in radicle.
The radicle is blunt and is about 3⁄4 mm in length, while the cotyledons are 1⁄2 mm long.
The initial stem on which they stand was called the Radicle.