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From The Collaborative International Dictionary of English v.0.48:
Wahoo \Wa*hoo"\, n. Any of various American trees or shrubs; specif.: (a) A certain shrub (Evonymus atropurpureus) having purple capsules which in dehiscence expose the scarlet-ariled seeds; -- called also burning bush. (b) Cascara buckthorn. (c) Basswood. [Webster 1913 Suppl.]