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: O O. Oa Ob Oc Od Oe Of Og Oh Oi Oj Ok Ol Om On Oo Op Oq Or Os Ot Ou Ov Ow Ox Oy Oz
orthite | orthoëpic | orthoëpical | orthoëpist | orthoëpy | ortho- | orthoboric acid | orthocarbonic | orthocenter | orthoceras | orthoceratite

ortho-

CIDE DICTIONARY

ortho-pref. [Gr. 'orqo`s straight; akin to Skr. upright, v to grow, to cause to grow.].
  •  A combining form signifying straight, right, upright, correct, regular; as, orthodromy, orthodiagonal, orthodox, orthographic.  [1913 Webster]
  •  A combining form (also used adjectively)  [1913 Webster]
    " 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."  [1913 Webster]

OXFORD DICTIONARY

ortho-, comb. form 1 a straight, rectangular, upright. b right, correct.
2 Chem. a relating to two adjacent carbon atoms in a benzene ring. b relating to acids and salts (e.g. orthophosphates) giving meta- compounds on removal of water.

Etymology
Gk orthos straight

For further exploring for "ortho-" in Webster Dictionary Online


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