διπλόη,ἡ,
A. fold, doubling,
Gal. 2.710 : but usu.,
II. porous substance between the double plates in the bones in the skull,
Hp. VC 1 , 17 , Heliod. ap. Orib. 46.9.4 , Ruf. Onom. 135 : generally,spongy coreof bone, Paul.Aeg. 6.77 ; also,tissue between layersof intestine, Aret. SD 2.9 : hence,
2. weak spot, flawin metal, Pl. Sph. 267e , Ph. Bel. 71.28 , Plu. 2.802b : metaph.,αἱ δ. τῆς ψυχῆςib. 715f , cf. 441d ; 'patchiness', Plot. 5.2.1 ; also,concealed sense,in oracles, Plu. 2.407c .
III. hollow stingof the scorpion, Ael. NA 9.4 .