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Meaning Of Ortho-
A combining form signifying straight, right, upright,
correct, regular; as, orthodromy, orthodiagonal, orthodox,
orthographic.
A combining form (also used adjectively)
The one of several acids of the same element (as the
phosphoric acids), which actually occurs with the greatest number of
hydroxyl groups; as, orthophosphoric acid. Cf. Normal.
Connection with, or affinity to, one variety of isomerism,
characteristic of the benzene compounds; -- contrasted with meta- or
para-; as, the ortho position; hence, designating any substance showing
such isomerism; as, an ortho compound.