Walking or standing erect; denoting the posture of humans; opposed to pronograde. [ortho- + L. gradior, pp. gressus, to walk]
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or·tho·grade 'ȯr-thə-.grād adj
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or·tho·grade (orґtho-grād″) [ortho- + L. gradi to walk] characterized by walking with the body upright, such as the bipeds. Cf. pronograde.Medical dictionary. 2011.