An archaic or obsolete spelling of 'dispel'; to drive away, scatter, or cause to vanish.
From Old French dispeller, from Latin dispellere (dis- = away + pellere = to drive). The modern spelling 'dispel' has replaced this variant.
This is a fascinating example of how spelling has been standardized over time—'dispell' with two L's was once acceptable, but modern spelling reformed it to the single-L 'dispel' we use today.
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