This article argues that, contrary to current views, the Albanian prefixoid kaca- (e.g. kacadre 'stag beetle' < dre 'stag; deer'), as well as its occasional variants kaça-, kaci-, kaçi- and kacu- (e.g. kaçadredhë 'curled object; curl; curl of hair' < dredhë 'twist, curve, curl'; kacimare 'water chestnut' < mare 'strawberry tree and its fruit'; kaçirubë 'crest; rooster's comb; forelock; mane' < rubë '(black) kerchief; head kerchief; handkerchief'; kacubri 'beetle' < bri 'horn; antenna') are neither just expressive, nor borrowed from the Greek prefix kata- [κατα- ], but rather from identical Modern Greek prefixoids, all of which may ultimately go back to the Greek word άκανθα 'thorn; spine', which is most probably also the source of Modern Greek katsarós [κατσαρός] 'curly' and possibly variously connected with other Albanian and Modern Greek words denoting pointedness, sharpness, scaliness, protrusion, roughness and the like. Such conclusions are reached through a close diachronic and synchronic examination and comparison of phonological, morphological and semantic properties of those affixes and lexemes.