thimble Syllabification: (thim·ble)Pronunciation: /ˈTHimbəl/Translate thimble | into French | into German | into Italian | into Spanish Definition of thimble noun a metal or plastic cap with a closed end, worn to protect the finger and push the needle in sewing. a short metal tube or ferrule. Nautical a metal ring, concave on the outside, around which a loop of rope is spliced. Origin: Old English thȳmel 'finger protector' (see thumb, -le1.)thimble in other Oxford dictionaries Definition of thimble in the British & World English dictionary