A special mark added to a letter to indicate a different pronunciation, stress, tone, or meaning.

Showing wickedness typical of a devil. / Extremely evil or cruel.

(transitive, medicine) To determine which disease is causing a sick person's signs and symptoms; to find the diagnosis. / (by extension) To determine the cause of a problem.

A plan, drawing, sketch or outline to show how something works, or show the relationships between the parts of a whole. / A graph or chart.

(transitive) To represent or indicate something using a diagram. / (UK) To schedule the operations of a locomotive or train according to a diagram.

A conversation or other form of discourse between two or more individuals.

(American spelling, informal, business) To discuss or negotiate so that all parties can reach an understanding.

A sundial marking canonical hours. / An elliptical plate marking the state of the ocean tides.

A gastrointestinal disorder characterized by frequent and very soft or watery bowel movements. / The watery or very soft excrement that comes from such bowel movements.

A nomogram.