di-diurnaladj.
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Given in N.E.D. (1895) as meaning ‘occurring twice a day’, based on a misreading or miscopying of bi-diurnal in quot. 1851 for bi-diurnal adj. at bi- comb. form 1d(b).
This entry has not yet been fully updated (first published 1895; most recently modified version published online June 2021).
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adj.