Ortho Definition
ôrthō
adjective
Orthochromatic.
American Heritage
prefix
Straight; upright; vertical.
Orthotropous.
American Heritage
Perpendicular.
Orthorhombic.
American Heritage
Correct; correction.
Orthopsychiatry.
American Heritage
The most fully hydrated form of an acid or of its salts.
Orthoboric acid.
American Heritage
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.
American Heritage
affix
Straight, regular, upright.
Orthognathous.
Webster's New World
At right angles, perpendicular.
Orthorhombic.
Webster's New World
Proper, correct, standard.
Orthography.
Webster's New World
That acid (of a group containing the same nonmetallic element) which has the largest number of OH groups per atom of the nonmetal.
Orthophosphoric acid.
Webster's New World
Characterized by substitutions in the 1, 2 position in the benzene ring.
Webster's New World
noun
(chemistry) An isomer of a benzene derivative having two substituents adjacent on the ring.
Wiktionary
(astronomy) A certain type of flat eyepiece.
Wiktionary
(photography, dated) An orthochromatic plate.
Wiktionary
(imaging) An orthophoto.
Wiktionary
Other Word Forms of Ortho
Noun
Singular:
orthoPlural:
orthosOrigin of Ortho
Middle English from Old French from Latin from Greek from orthos straight, correct, right
From American Heritage Dictionary of the English Language, 5th Edition
Ancient Greek ὀρθός (orthos).
From Wiktionary
From ortho–
From American Heritage Dictionary of the English Language, 5th Edition
Find Similar Words
Find similar words to ortho using the buttons below.