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The Collaborative International Dictionary
Shrinking head

Shrinking \Shrink"ing\, a. & n. from Shrink.

Shrinking head (Founding), a body of molten metal connected with a mold for the purpose of supplying metal to compensate for the shrinkage of the casting; -- called also sinking head, and riser.

Usage examples of "shrinking head".

He heard titters and muffled laughter, and was conscious of probing glances riveted on his shrinking head.