From feather + down. <span class="searchmatch">featherdown</span> (uncountable) Down (soft, fluffy immature feathers used in bedding). down feather, downfeather...
See also: down feather downfeather (plural downfeathers) Alternative form of down feather. <span class="searchmatch">featherdown</span>...
Wikipedia has an article on: down feather Wikipedia down feather (plural down feathers) A feather of the down of a bird. powder-down feather <span class="searchmatch">featherdown</span>...
feather-brained, featherbrained feather Christmas tree feathercoat featherdom <span class="searchmatch">featherdown</span> feather-dust feather duster feather duster worm feather edge feather...
duck down dumbed-down East Down eat down eiderdown evendown fasten down <span class="searchmatch">featherdown</span> first down (US and Canadian football) fish down flake down flat down...