from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A valve regulated by the position of a free-floating ball that moves in response to fluid or mechanical pressure.
from the GNU version of the Collaborative International Dictionary of English
- n. a contrivance by which a ball, placed in a circular cup with a hole in its bottom, operates as a valve.
from The Century Dictionary and Cyclopedia
- n. A valve formed by a globe resting upon a concave circular seat.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any valve that checks flow by the seating of a ball
Sorry, no etymologies found.