-oin

== Finnish == === Etymology === From earlier *-ain, from the instructive plural forms of some nouns. === Suffix === -oin (front vowel harmony variant -öin, linguistic notation -Oin) Forms temporal adverbs. ==== Derived terms ==== === Further reading === Hakulinen, Lauri. 1941–2000. Suomen kielen rakenne ja kehitys ('The Structure and Development of the Finnish Language'). Helsinki: Otava/Helsingin yliopisto. === Anagrams === noi