From Proto-Italic *kaikos (“blind, eyeless”), from Proto-Indo-European *kéh₂ikos (“one-eyed”). Cognates include Gothic 𐌷𐌰𐌹𐌷𐍃 (haihs), Old Irish cáech (“one-eyed”), caoch (“blind”).
Practice speaking and memorizing "caecus" and many other words and sentences in Latin.