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The Collaborative International Dictionary of English v.0.48 (gcide)

-graph \-graph\ (-gr[.a]f) [From Gr. gra`fein to write. See
{Graphic}.]
A suffix signifying something written (as in {digraph}), a
writing; also, a writer or an instrument that produces a
written or visible record of a measurement, such as a
spectrograph; as, autograph, crystograph, telegraph,
photograph.
[1913 Webster PJC]


Graph \Graph\ (gr[.a]f), n. [See {-graph}.] (Math.)
1. A curve or surface, the locus of a point whose coordinates
are the variables in the equation of the locus; as, a
graph of the exponential function.
[Webster 1913 Suppl.]

2. A diagram symbolizing a system of interrelations of
variable quantities using points represented by spots, or
by lines to represent the relations of continuous
variables. More than one set of interrelations may be
presented on one graph, in which case the spots or lines
are typically distinguishable from each other, as by
color, shape, thickness, continuity, etc. A diagram in
which relationships between variables are represented by
other visual means is sometimes called a graph, as in a
{bar graph}, but may also be called a {chart}.
[Webster 1913 Suppl. PJC]