'Dunker' definitions:

Definition of 'dunker'

noun

An eater who dips food into a liquid before eating it; "he was a dunker--he couldn't eat a doughnut without a cup of coffee to dunk it in"

noun

A basketball player who is able to make dunk shots

noun

An adherent of Baptistic doctrines (who practice baptism by immersion) [syn: Dunker, Dunkard, Tunker]

From: GCIDE

Dunker \Dun"ker\, prop. n. [G. tunken to dip.] One of a religious denomination whose tenets and practices are mainly those of the Baptists, but partly those of the Quakers; -- called also Tunkers, Dunkards, Dippers, and, by themselves, Brethren, and German Baptists, and they call their denomination the Church of the Brethren. [1913 Webster]
Note: The denomination was founded in Germany in 1708, but after a few years the members emigrated to the United States; they were opposed to military service and taking legal oaths, and practiced trine immersion. [1913 Webster + WordNet 1.5]
Seventh-day Dunkers, a sect which separated from the Dunkers and formed a community, in 1728. They keep the seventh day or Saturday as the Sabbath. [1913 Webster]

From: GCIDE

Dunbird \Dun"bird`\, n. [Named from its color.] (Zool.) (a) The pochard; -- called also dunair, and dunker, or dun-curre. (b) An American duck; the ruddy duck. [1913 Webster]