from
The Collaborative International Dictionary of English v.0.48
Fusible \Fu"si*ble\, a. [F. fusible. See {Fuse}, v. t.]
CapabIe of being melted or liquefied.
[1913 Webster]
{Fusible metal}, any alloy of different metals capable of
being easily fused, especially an alloy of five parts of
bismuth, three of lead, and two of tin, which melts at a
temperature below that of boiling water. --Ure.
{Fusible plug} (Steam Boiler), a piece of easily fusible
alloy, placed in one of the sheets and intended to melt
and blow off the steam in case of low water.
[1913 Webster]