Entry 1 sense Webster, 1913 Water chinquapin · Wa·ter chin·qua·pin · IPA 01 The American lotus, and its edible seeds, which somewhat resemble chinquapins. Cf. Yoncopin. 1. The American lotus, and its edible seeds, which somewhat resemble chinquapins. Cf. Yoncopin.(Bot.) See: Yoncopin