Originally a proprietary name (1940s), from launder + -ette.
Pronunciation
Lua error in Module:parameters at line 360: Parameter 1 should be a valid language or etymology language code; the value "RP" is not valid. See WT:LOL and WT:LOL/E.IPA(key): /lɔːnˈdɹɛt/
Lua error in Module:parameters at line 360: Parameter 1 should be a valid language or etymology language code; the value "US" is not valid. See WT:LOL and WT:LOL/E.IPA(key): /lɔndəˈɹɛt/