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1911 Encyclopedia Britannica
(a word of obscure origin; the earliest form seems to be higre, Latinized as higra, which William of Malmesbury gives as the name of the bore in the Severn; the New English Dictionary rejects the usual derivations from the O. Eng. eagor or egos, which is seen in compounds meaning "flood," and also the connexion with the Norse sea-god Aegir), a tide wave of great height rushing up an estuary (see Bore), used locally of the Humber and Trent.
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Chisholm, Hugh, General Editor. Entry for 'Eagre'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/e/eagre.html. 1910.