The spelling of the word "alnuin" is peculiar and may not be familiar to many. It is derived from the Latin word "alnus" which means "alder tree". The IPA phonetic transcription of "alnuin" is /ˈælnjʊɪn/. The use of the letter "n" instead of "r" at the end is due to the historical pronunciation of the word. In Old English, the letter "r" was often pronounced as a vowel, thus the spelling of "alnuin" reflects the Old English pronunciation of the word.
A substance derived from the bark of the alder, one of several species of Alnus; it has been used as a tonic in doses of gr. 2-5 (0.12-0.3).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.