Pronunciation: (ir"i-tu-bil'i-tē), [key]
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.