Strong's Hebrew: 8414. tohuw (to'-hoo)
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8414. tohuw (to'-hoo)
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From an unused root meaning to lie waste; a desolation (of surface), i.e. Desert; figuratively, a worthless thing; adverbially, in vain -- confusion, empty place, without form, nothing, (thing of) nought, vain, vanity, waste, wilderness.
Strong's Numbers Online Bible Dictionary