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

erratic

noun
 
/ɪˈrætɪk/
 
/ɪˈrætɪk/
(also erratic block, erratic boulder)
(geology)
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  1. a large rock that is different from the rock around it 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 erratic in the Oxford Advanced American Dictionary
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aspiration
noun
 
 
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