お煎せんMeanings1nounrice cracker; senbeiAbbreviation of お煎餅 (o-senbei), a polite form of 煎餅 (senbei). Used in casual conversation or shop signs.See also: 煎餅お煎せんを一いち枚まいどうぞ。Please have a rice cracker.このお煎せんは醤しょう油ゆ味あじです。This rice cracker is soy sauce flavored.