Hollow Tube in Which a Piston Moves
This page is the CodyCross answer for the clue below from Popcorn Time, Group 391, Puzzle 5 (Leading Lady).
Question is: Hollow Tube in Which a Piston Moves
and the answer is: CYLINDER
Word Meaning:
CYLINDER — (geometry) A surface created by projecting a closed two-dimensional curve along an axis intersecting the plane of the curve.
Definitions from Wiktionary.