þumalputtaregla

== Icelandic == === Etymology === From þumalputti (“thumb”) +‎ regla (“rule”). === Pronunciation === IPA(key): /ˈθʏːmal.pʰʏhtaˌrɛkla/ === Noun === þumalputtaregla f (genitive singular þumalputtareglu, nominative plural þumalputtareglur) rule of thumb ==== Declension ====