Merriam-Webster Collegiate Dictionary - kid

 I. noun  Etymology: Middle English ~e, of Scandinavian origin; akin to Old Norse kith ~  Date: 13th century  1.  a. a young goat  b. a young individual of various animals related to the goat  2.  a. the flesh, fur, or skin of a ~  b. something made of ~  3. a young person; especially child — often used as a generalized reference to one especially younger or less experienced the ~ on the pro golf tour poor ~  • ~dish adjective  II. intransitive verb  (~ded; ~ding)  Date: 15th century to bring forth young — used of a goat or an antelope  III. adjective  Date: 1895 younger my ~ brother  IV. verb  (~ded; ~ding)  Etymology: probably from 1~  Date: circa 1873  transitive verb  1.  a. to deceive as a joke it's the truth; I wouldn't ~ you  b. to fail to admit the truth to they're ~ding themselves  2. to make fun of  intransitive verb to engage in good-humored fooling or horseplay — often used with around  • ~der noun  • ~dingly adverb KID  biographical name see Kyd