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Webster's 1913 Dictionary
PENTAMETHYLENE
Pen
`
ta
*
meth
"yl *
ene,
n.
Etym:
[
Penta-
+
methylene.
] (
Chem.
)
Defn: A
hypothetical
hydrocarbon,
C5H1 ,
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.
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