a whirring sound, such as a phone ringing tone or the sound of cogs turning

a rough edge or ridge left on an object (especially of metal) by the action of a tool or machine

a small rotary cutting tool with a shaped end, used chiefly in woodworking and dentistry

a siliceous rock used for millstones

a prickly seed case or flower head that clings to clothing and animal fur

denoting wood containing knots or other growths which show a pattern of dense swirls in the grain when sawn, used for veneers and other decorative woodwork

burr walnut

the coronet of a deer's antler

make a whirring sound

form a rough edge on (metal)