from the GNU version of the Collaborative International Dictionary of English
- n. An apparatus for conveying heat, as a case containing material which retains its heat for a considerable period.
from The Century Dictionary and Cyclopedia
- n. A device to prevent undue cooling of the masks used in the administration of ether. For this purpose ample provision is made for the conduction of heat, through a metallic attachment, to the surfaces cooled by evaporation.
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