from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A valve regulated by the position of a free-floating ball that moves in response to fluid or mechanical pressure.
from The Century Dictionary.
- noun A valve formed by a globe resting upon a concave circular seat.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun any valve that checks flow by the seating of a ball
Sorry, no etymologies found.
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