from The Century Dictionary and Cyclopedia
- Shaped like a cylinder terminated by a cone.
Sorry, no etymologies found.
They were charged with pyroxyle, taking into consideration its explosive power, which, as has been said, is four times that of ordinary powder: the projectile to be fired was cylindroconic.
Harding then took the tube out of Herbert’s hands, and, giving it a pendulous motion, he ended by lengthening the malleable bubble so as to give it a cylindroconic shape.