Di"a*gram (?), n. [Gr. , fr. to mark out by lines; through + to draw, write: cf. F. diagramme. See Graphic.]
1. Geom.
A figure or drawing made to illustrate a statement, or facilitate a demonstration; a plan.
2.
Any simple drawing made for mathematical or scientific purposes, or to assist a verbal explanation which refers to it; a mechanical drawing, as distinguished from an artistical one.
Indicator diagram. Steam Engine See Indicator card, under indicator
© Webster 1913.
Di"a*gram, v. t.
To put into the form of a diagram.
© Webster 1913.