• -ous

    Alternative forms


    From Old French -ous and -eux, from Latin -ōsus ("full, full of").

    Full definition of -ous


    1. Used to form adjectives from nouns.bulbous from bulbcourageous from couragejoyous from joypoisonous from poisonriotous from riot
    2. (chemistry) Used in chemical nomenclature to name chemical compounds in which a specified chemical element has a lower oxidation number than in the equivalent compound whose name ends in the suffix -ic. For example sulphuric acid (H2SO4) has more oxygen atoms per molecule than sulphurous acid (H2SO3). See Inorganic nomenclature.

    Derived terms

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