The Collaborative International Dictionary
Inirritable
Inirritable \In*ir"ri*ta*ble\, a. [Pref. in- not + irritable: cf. F. inirritable.] Not irritable; esp. (Physiol.), incapable of being stimulated to action, as a muscle. -- In*ir`ri*ta*bil"i*ty, n.
Wiktionary
inirritable
a. (context biology archaic English) Incapable of being stimulated to action, as a muscle.