PENTINE
Pen"tine, n. Etym: [See Penta-.] (Chem.)
Definition: An unsaturated hydrocarbon, C5H8, of the acetylene series. Same as Valerylene.
Source: Webster’s Unabridged Dictionary 1913 Edition
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8 May 2025
INSULATION
(noun) the act of protecting something by surrounding it with material that reduces or prevents the transmission of sound or heat or electricity
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