Hypertext Webster Gateway: "spillway"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Spillway \Spill"way`\, n.
A sluiceway or passage for superfluous water in a reservoir,
to prevent too great pressure on the dam.
From WordNet (r) 1.7 (wn)
spillway
n : a channel that carries excess water over or around a dam or
other obstruction [syn: {spill}, {wasteweir}]
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