Entry 2 senses · 2 variants Webster, 1913 Excelsior · Ex·cel·si·or · IPA /ɛkˈsɛl.si.ɚ/ a. n. 01 a. More lofty; still higher; ever upward. 1. More lofty; still higher; ever upward. 02 n. A kind of stuffing for upholstered furniture, mattresses, etc., in which curled shreds of wood are substituted for curled hair. 1. A kind of stuffing for upholstered furniture, mattresses, etc., in which curled shreds of wood are substituted for curled hair.