tonfedd

== Welsh == === Etymology === ton +‎ -fedd === Pronunciation === IPA(key): /ˈtɔnvɛð/ Rhymes: -ɔnvɛð === Noun === tonfedd f (plural tonfeddi) wavelength ==== Derived terms ==== amldonfedd (“multiwavelength, relating to multiple wavelengths”) tonfeddol (“wavelengthly”) === Mutation ===