|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.|
ortho- or orth-
Straight; upright; vertical: orthotropic.
Correct; correction: orthopsychiatry.
Hydrated form of an acid or of its salts: orthoboric acid.
Diatomic molecules in which the nuclei have the same direction of spin: orthohydrogen.
Abbr. o- Of or relating to one of three possible isomers of a benzene ring with adjacent carbon atoms having attached chemical groups. Usually used in italic: ortho-dibromobenzene.
American Orthopsychiatric Association