† ostourn.

Etymology: < Anglo-Norman ostur, ostour, hostour (compare Old French ostur , hostur (c1100), ostour (12th cent.), Middle French ostouer (1383), austour (1479), Middle French, French autour (15th cent.)) < post-classical Latin aucceptor (8th cent.), alteration (influenced by classical Latin avis bird, auceps bird catcher) of classical Latin acceptor , alteration (influenced by classical Latin accipere to take) of accipiter accipiter n. Compare post-classical Latin astur (Firmicus, c340). Old French ostur > post-classical Latin austur (a1254 in a continental source), asturco (1086, 1528 in British sources, 1212 in a continental source), asturcus (c1200, 15th cent. in British sources, 1328 in a continental source), austurco (a1200, c1279 in British sources), austurcus (frequently 1159–1346 in British sources), austurcius (1334 in a British source); ostor (1274 in a British source), ostorius (1208, 1333 in British sources), osturcius (1244, c1275 in British sources), osturcus (1210, 1242 in British sources), osturius (c1150, 1219 in British sources). See also austringer n.Compare also Middle English ostrey in the same sense (one isolated attestation; apparently alteration of ostour n., with ending remodelled after osprey n.); compare:c1475 (?c1300) Guy of Warwick (Caius) 3154 Ostreyes and faukons, girfaukes also.