Hypertext Webster Gateway: "paraxylene"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Xylene \Xy"lene\, n. [Gr. xy`lon wood.] (Chem.)
Any of a group of three metameric hydrocarbons of the
aromatic series, found in coal and wood tar, and so named
because found in crude wood spirit. They are colorless, oily,
inflammable liquids, {C6H4.(CH3)2}, being dimethyl benzenes,
and are called respectively {orthoxylene}, {metaxylene}, and
{paraxylene}. Called also {xylol}.
Note: Each of these xylenes is the nucleus and prototype of a
distinct series of compounds.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Paraxylene \Par`a*xy"lene\, n. (Chem.)
A hydrocarbon of the aromatic series obtained as a colorless
liquid by the distillation of camphor with zinc chloride. It
is one of the three metamers of xylene. Cf. {Metamer}, and
{Xylene}.
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