From Proto-Japonic *pəsə (“navel”).
*poso
- navel
- Northern Ryukyuan:
- Kikai: 臍, 蔕, 枘 (pusu, fusu)
- Kunigami: 臍, 蔕, 枘 (phusū)
- Northern Amami-Oshima: 臍, 蔕, 枘 (fusu)
- Okinawan: 臍, 蔕, 枘 (fusu)
- Oki-No-Erabu: 臍, 蔕, 枘 (fusu, fusū)
- Southern Amami-Oshima: 臍, 蔕, 枘 (fusu)
- Toku-No-Shima: 臍, 蔕, 枘 (fushu)
- Yoron: 臍, 蔕, 枘 (pusu)
- Southern Ryukyuan:
- Miyako: 臍, 蔕, 枘 (pusu)
- Yaeyama: 臍, 蔕, 枘 (pusu, pusï)
- Yonaguni: 臍, 蔕, 枘 (fusu)
- Thorpe, Maner Lawton (1983) Ryūkyūan Language History[1], Doctoral dissertation. University of Southern California, page 310