† weekfishObs. [ad.Du.weekvisch, f.week soft + visch fish. Cf. weakfish.] A fish of the Dutch East Indies, the size of a whiting, esteemed a delicacy. 1686Ray Willughby's Hist. Pisc.App. 6 Pisces Indiæ Orientalis a Joanne Nieuhofs Descripti... Wit fish or Week fish.