御三時[osanji] three-o'clock snack
三鞭酒[shanpen] champagne
球面三角法[kyuumensankakuhou] spherical trigonometry
胸三寸[munesanzun] heart
元三[ganzan] New Year's period (January 1st to 3rd)

五十三次[gojuusantsugi] the 53 Toukaidou stages
向こう三軒[mukousangen] one's next three neighbors
降三世明王[gouzanzemyouou] Trailokyavijaya Vidya-raja
再三[saisan] again and again
再三再四[saisansaishi] repeatedly

胃腸[ichou] stomach
回腸[kaichou] ileum
結腸[kecchou] colon
鼓腸[kochou] flatulence
十二指腸[juunishichou] duodenum

十二指腸虫[juunishichouchuu] hookworm
大腸[daichou] large intestine
脱腸[dacchou] abdominal hernia
断腸[danchou] heartbreak
断腸の思い[danchounoomoi] heartbroken thoughts