Definition of growth ring noun from the Oxford Advanced Learner's Dictionary


growth ring

BrE BrE//ˈɡrəʊθ rɪŋ//
; NAmE NAmE//ˈɡroʊθ rɪŋ//
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a layer of wood, shell or bone developed in one year, or in another regular period of growth, that an expert can look at to find out how old something is
See the Oxford Advanced American Dictionary entry: growth ring