имя существительное [множественное число] coccyges, coccyxes; [анатомия] копчик
анатомия копчик, хвостец
noun (plural coccyges; also coccyxes) Etymology: New Latin, from Greek kokkyx cuckoo, coccyx; from its resemblance to a cuckoo's beak a small bone that articulates with the sacrum and that usually consists of four fused vertebrae which form the terminus of the spinal column in humans and tailless apes