Dī'a-gram, n.

n. [Gr. διάγραμμα, from διαγράφειν, to mark out by lines, from διά, through, and γράφειν, to draw, write; Fr. diagramme.]

1. (Geom.) A figure or drawing made to illustrate a statement, or facilitate a demonstration.
2. Any illustrative outline, figure, or drawing.
3. (Anc. Mus.) The table or model representing all the sounds of the system. Moore.

Indicator diagram. (Steam-engines.) See INDICATOR CARD.