WordReference Random House Unabridged Dictionary of American English © 2026
cyl•in•droid
(sil′in droid′),USA pronunciation n.
adj.
- Mathematicsa solid having the form of a cylinder, esp. one with an elliptical, as opposed to a circular, cross section.
adj.
- Mathematicsresembling a cylinder.
- Greek kylindroeidé̄s cylinderlike. See cylinder, -oid
- 1655–65