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

 

nodule

 noun
noun
BrE BrE//ˈnɒdjuːl//
 
; NAmE NAmE//ˈnɑːdʒuːl//
 
 
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a small round lump or swelling, especially on a plant Word Origin late Middle English: from Latin nodulus, diminutive of nodus ‘knot’.
See the Oxford Advanced American Dictionary entry: nodule