The word "毛绒绒" is formed by combining the character "毛" (máo), meaning fur or hair, with the duplicated character "绒" (róng), meaning velvet or fluff. The duplication of "绒" to "绒绒" intensifies the descriptive quality, emphasizing a state of being fluffy or furry. Together, "毛绒绒" functions as an adjective describing something as densely soft and hairy, like plush fabric or animal fur.