- 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.
Definition
