Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of proto- is as below...

Proto- :: Proto- () A combining form prefix signifying first, primary, primordial; as, protomartyr, the first martyr; protomorphic, primitive in form; protoplast, a primordial organism; prototype, protozoan..

Protoxide :: Protoxide (n.) That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b)..

Proto- :: Proto- () Sometimes used as equivalent to mono-, as indicating that the compound has but one atom of the element to the name of which it is prefixed. Also used adjectively..

Proto- :: Proto- () Denoting the first or lowest of a series, or the one having the smallest amount of the element to the name of which it is prefixed; as protoxide, protochloride, etc..

Proto-doric :: Proto-Doric (a.) Pertaining to, or designating, architecture, in which the beginnings of the Doric style are supposed to be found..

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