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From The Collaborative International Dictionary of English v.0.48:
graphology \gra*phol"o*gy\ (gr[.a]*f[o^]l"[-o]*j[y^]), n. [Gr. gra`fein to write + -logy: cf. F. graphologie.] 1. The art of judging of a person's character, disposition, and aptitude from his handwriting; called graphoanalysis by its practitioners. Though its practitioners consider it a science, it is widely considered a pseudoscience, as is astrology. [1913 Webster +PJC] 2. (Math.) The system or notation used in dealing with graphs. [Webster 1913 Suppl.] 3. (Linguistics) The study of systems of writing of languages; also called grammatology. [PJC]