field-abbotn.historical (now rare) a lay person who is given charge of an abbey in return for military service.
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field-abbot1833
1833 E. HendersonBuck's Theol. Dict. (new ed.) 2/2 The abbots..became a kind of military clergy, whose superiors bore, in the camp, the name of field-abbots.
1913 Everyman Encycl. I. 8/1 In the tenth century there were field-abbots (in Latin ‘Abbates Milites’), and abbot-counts.