ἀρθρωδία
From LSJ
ὁ ὑπεράπειρον ἔχων τῆς ἀγαθότητος τὸ ἀνεξιχνίαστον πέλαγος → who possesses an infinite and inscrutable sea of goodness
English (LSJ)
ἡ, a particular kind of
A articulation, where the surfaces are only slightly concave and convex, ib.736.