Duce

According to the Old English Dictionary:

an;

DUCE

f. A DUCK; anas :-- On ducan seáþe, of ducan seáþe to the duck's pond, from the duck's pond, Cod. Dipl. 538; A. D. 967; Kmbl. iii. 18, 16, 17: Apndx. 308; A. D. 875; Kmbl. iii. 399, 18. [Piers P. Chauc. doke: Plat. düker: Kil. duycker mergus.] duce