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Webster 1913 Edition
Pentamethylene
Penˊta-meth′yl-ene
,Noun.
[
Penta-
+ methylene
.] (Chem.)
A hypothetical hydrocarbon,
C5H10
, metameric with the amylenes, and the nucleus of a large number of derivatives; – so named because regarded as composed of five methylene residues. Cf. Trimethylene
, and Tetramethylene
.