[f. Gr. ἀριθμό-ς number + γράμμα a thing written: see -GRAM.] A number expressed by the letters of a word, name, or phrase, e.g., the number 666 made up by the Greek letters of the word λατεῖνος (for λατῖνος).
1869. Ld. Strangford, Selection, II. 301. I have always been baffled in my efforts to work it [Dr. Cumming’s name] out honestly as an arithmogram.
