Dictionary
ir•ri•ta•bil•i•ty
Pronunciation: (ir"i-tu-bil'i-tē), [key]—
n.,
—pl. -ties.
1. the quality or state of being irritable.
2. Physiol., Biol.the ability to be excited to a characteristic action or function by the application of some stimulus:
Protoplasm displays irritability by responding to heat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.