Bum"kin (?), n. [Boom a beam + -
kin. See Bumpkin.] (Naut.) A projecting beam or
boom; as: (a) One projecting from each bow of a vessel, to
haul the fore tack to, called a tack bumpkin. (b)
One from each quarter, for the main-brace blocks, and called brace
bumpkin. (c) A small outrigger over the stern of a
boat, to extend the mizzen. [Written also boomkin.]