Definition of red ash
1a : an American ash (Fraxinus pennsylvanica) with densely velvety tomentose branchlets and petioles and lower leaf surfaces pubescent —called also downy ash — see green ash b : an Australian tree (Alphitonia excelsa) of the family Rhamnaceae with hard wood c : an Australian tree (Orites excelsa) of the family Proteaceae
2 : the wood of a red ash tree
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