1. an adjective suffix meaning `having', `full of', `given to', `characterised by', `of the nature of', `like', etc., as in glorious, joyous, mucous, nervous, sonorous, wondrous.

2. Chemistry a suffix used to imply the lower of two possible valencies compared to the corresponding suffix -ic, as stannous chloride, SnCl2, and stannic chloride, SnCl4.
Also, -eous, -ious. {Middle English, from Old French, from Latin -ōsus; often used to represent Latin -us (adjective), Greek -os (adjective); in a few words (e.g. wondrous) it is attached to English stems}

Australian English dictionary. 2014.

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