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From The Collaborative International Dictionary of English v.0.48:
Nauseous \Nau"seous\ (?; 277), a. [L. nauseosus.] 1. Causing, or fitted to cause, nausea; sickening; loathsome; disgusting; exciting abhorrence; as, a nauseous drug or medicine. [1913 Webster] 2. Feeling nausea; as, nauseous from the effects of chemotherapy. [PJC] -- Nau"seous*ly, adv. -- Nau"seous*ness, n. [1913 Webster] The nauseousness of such company disgusts a reasonable man. --Dryden. [1913 Webster]