Noctern

According to the Old English Dictionary:

es;

noctern

m. A nocturn, one of the divisions of the office of matins :-- Syx nocternes þæs æftran sealmas sex nocturne, posterioris psalmi, Angl. xiii. 404, 561. Tó nocterne ad nocturnam, 426, 870. Æfter nocternum post nocturnas, 437, 1027. Tó nocternum. ad nocturnos, 434, 990. Tó nocternan ad nocturnas, 396, 448. Gedónum nocternum peractis nocturnis, 380, 220. [From Latin.] noctern