The formulation is corrupt in the Etym. Genuinum, and καὶ probably replaced an older διά "because of its sharpness", explanation justifying the etymology, which is introduced by παρά. The Etym. Magnum replaced the Genitive by a Accusative depending on παρά (see Parallels). The etymology is purely paronymic, because the two words share the two syllables [belo], and was justified by a common feature, the fact that both he missile (spear, arrow) and the needle are sharp,. The fact that a needle is not thrown was apparently not a valid objection. This etymology explains the other etymology by βάλλω, as βάλλω is the etymon of βέλος: therefore X, etymon of Y, etymon of N, can also be given as the etymon of N