/ Dictionary / Index E encephalasthenia: Meaning and Definition of Find definitions for: en•ceph•a•las•the•ni•a Pronunciation: (en-sef"u-lus-thē'nē-u), [key] — n. Pathol. mental fatigue caused by emotional stress. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. encephalalgia encephalic Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language