The Collaborative International Dictionary of English v.0.48:
Noonshun \Noon"shun\, n. [Obs.] See Nunchion. --Nares. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Nunchion \Nun"chion\, n. [OE. nonechenche, for noneschenche, prop., a noon drink; none noon + schenchen, schenken, skinken, to pour, AS. scencan. See Noon, and Skink, v. i.] A portion of food taken at or after noon, usually between full meals; a luncheon. [Written also noonshun.] --Hudibras. [1913 Webster]