Verb · A reduplicated and prolonged form of a primary preo {preh'-o}; which occurs only as an alternate in certain tenses)
A reduplicated and prolonged form of a primary πρέω préō preh'-o; which occurs only as an alternate in certain tenses); to fire, i.e. burn (figuratively and passively, become inflamed with fever):—be (X should have) swollen.
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Strongs concordance