Pertaining or relating to, or of the nature of, a diagram; represented by means of a diagram; consisting of a diagram; more generally, schematic and abstract.

adjective. Pertaining to, or of the nature of, a diagram; showing by diagram.

adjective. In the form of a diagram.

adjective. Of or pertaining to a diagram or to diagrammatics.

adjective. shown or represented by diagrams

"It is true that you cannot make a good chemist, or even apothecary, without giving days and weeks to exact use of balances or to watching filter papers and the like but the mere layman may learn in a short time with profit the meaning of a chemical equation, and find a kind of diagrammatic knowledge sufficient to meet all he requires."