American Heritage® Dictionary of the English Language, Fourth Edition
- Straight; upright; vertical: orthotropous.
- Perpendicular: orthorhombic.
- Correct; correction: orthopsychiatry.
- The most fully hydrated form of acid or of its salts: orthoboric acid.
- Diatomic molecules in which the nuclei have the same spin direction: orthohydrogen.
- Of or relating to one of three possible isomers of a benzene ring with two attached chemical groups in which the carbon atoms with attached groups are adjacent: ortho-dibromobenzene.
Century Dictionary and Cyclopedia
- n. An element in many words of Greek origin, its presence bringing in the sense of ‘straight,’ ‘upright,’ ‘right,’ ‘correct.’ In chem., specifically — As a prefix of benzene derivatives it denotes a substitution of hydrogen atoms in the benzene ring which are adjacent to each other.
- straight, right, proper
- chemistry Having an extra proportion of water
- chemistry in isomeric benzene derivatives, having the two substituents in adjacent positions (compare meta- and para-)
- physics of any molecule of the form X2 in which the two nuclei have parallel spin
GNU Webster's 1913
- A combining form signifying straight, right, upright, correct, regular.
- (Chem.) A combining form (also used adjectively)
- (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. Cf. Normal.
- (Organic Chem.)
Connection with, or affinity to, one variety of isomerism, characteristic of the benzene compounds; -- contrasted with meta-or para-; ; hence, designating any substance showing such isomerism.
- Ancient Greek ὀρθός (orthos). (Wiktionary)
- Middle English, from Old French, from Latin, from Greek, from orthos, straight, correct, right. (American Heritage® Dictionary of the English Language, Fourth Edition)
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