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Ortho-   Listen
prefix
Ortho-  pref.  
1.
A combining form signifying straight, right, upright, correct, regular; as, orthodromy, orthodiagonal, orthodox, orthographic.
2.
(Chem.) A combining form (also used adjectively), designating:
(a)
(Inorganic Chem.) 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.
(b)
(Organic Chem.) 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. Note: In the graphic representation of the benzene nucleus (see Benzene nucleus, under Benzene), provisionally adopted, any substance exhibiting double substitution in adjacent and contiguous carbon atoms, as 1 & 2, 3 & 4, 4 & 5, etc., is designated by ortho-; as, orthoxylene; any substance exhibiting substitution of two carbon atoms with one intervening, as 1 & 3, 2 & 4, 3 & 5, 4 & 6, etc., by meta-; as, resorcin or metaxylene; any substance exhibiting substitution in opposite parts, as 1 & 4, 2 & 5, 3 & 6, by para-; as, hydroquinone or paraxylene.






Collaborative International Dictionary of English 0.48








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"Ortho-" Quotes from Famous Books



... least must have the honor;—it could not be conceded to inferior Asia. All the languages of the group were examined and worried for evidence. Men said, 'By the names of trees we shall run it to earth'; and this was the doxy that was ortho-for some time. Light on a tree-name common to all the languages, and find in what territory that tree is indigenous: that will certainly be the place. As thus; I will work out for you a suggestion given in the encyclopaedia, ...
— The Crest-Wave of Evolution • Kenneth Morris



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