Definition of erratic noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ɪˈrætɪk//
; NAmE NAmE//ɪˈrætɪk//
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(also erratic block, erratic boulder) (geology) a large rock that is different from the rock around and was left behind when a large mass of ice melted Word Originlate Middle English: from Old French erratique, from Latin erraticus, from errare ‘to stray, err’.
See the Oxford Advanced American Dictionary entry: erratic

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