[1] Normally spelled ko/llic.
[2] kollu/ra in Aristophanes, Peace 123 is a loaf of bread like a ko/llic. The diminutive of kollu/ra (kappa 1977), kollu/rion ~ kollou/rion, could refer to a loaf of bread (as in 3 Kingdoms 12:24h LXX: "Arise and take in your hand for the man of God loaves of bread, and kollu/ria for his children"). The sense survives in Modern Greek koullou/ri "bagel". See also epsilon 2428.
However, the sense "pessary" (LSJ s.v. kollu/rion 1) is intended instead, as is clear from Additamenta in Etymologicum Gudianum and the Etymologicum Magnum s.v. e)piku/lluma: "For ko/llic is 'bread', hence the medical kollu/rion; from kolobo/s." (In fact, ko/llic itself can mean a trochisk, i.e. a tablet or lozenge: LSJ s.v. 2). The derivation from kolobo/s is given in kappa 1954.
[3] Aristophanes uses the stem only in the compound kollikofa/ge "bread-rolleater", in Acharnians 872.