Correct spelling for the English word "orthin" is [ˈɔːðɪn], [ˈɔːðɪn], [ˈɔː_ð_ɪ_n] (IPA phonetic alphabet).
"Orthin" is not a term that can be found in any conventional dictionary. It does not have an established meaning or recognized usage within the English language. Therefore, it is difficult to provide a dictionary definition for a term that is nonexistent or unfamiliar.
However, it is worth noting that sometimes words or terms may be unique to a specific field, profession, or community, thereby not appearing in general dictionaries. If "orthin" is a term used in a specific context, such as a particular industry, scientific discipline, or niche interest group, it would be helpful to provide more information to offer a more accurate and specific definition.
Without any context or further information, it is impossible to provide a proper dictionary definition of "orthin." It is recommended to perform an online search or consult relevant specialized literature or experts in the field in question to determine the meaning of the term and its appropriate usage.
An unstable synthetic antipyretic of the phenylhydrazine group; uncertain in its action and sometimes causing symptoms of poisoning.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.