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From The Collaborative International Dictionary of English v.0.48:
Od \Od\, n. [G., fr. Gr. ? passage.] (Physics) An alleged force or natural power, supposed, by Reichenbach and others, to produce the phenomena of mesmerism, and to be developed by various agencies, as by magnets, heat, light, chemical or vital action, etc.; -- called also odyle or the odylic force. [Archaic] [1913 Webster] That od force of German Reichenbach Which still, from female finger tips, burnt blue. --Mrs. Browning. [1913 Webster]