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effusion (n.)

c. 1400, effusioun, "a pouring out," from Old French effusion (14c.) and directly from Latin effusionem (nominative effusio) "a pouring forth," noun of action from past participle stem of effundere "pour forth, spread abroad; to lavish, squander, waste," from assimilated form of ex "out" (see ex-) + fundere "to pour" (from nasalized form of PIE root *gheu- "to pour"). Figuratively, of speech, emotion, etc., from 1650s.

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Definitions of effusion from WordNet

effusion (n.)
an unrestrained expression of emotion;
Synonyms: gush / outburst / blowup / ebullition
effusion (n.)
flow under pressure;
From wordnet.princeton.edu