Terminology
The Japanese compounds kanju 干珠 lit. "ebb jewel" and manju 満珠 lit. "flow jewel" combine kan 干 (cf. 乾) "dry up; drain off; ebb (tides); recede; oppose" and man 満 "fill; full; rise (tides); fulfill; satisfy" with ju, shu, or tama 珠 "gem; jewel; precious stone; pearl; bead". Compare the reversible compounds kanman 干満 and mankan 満干or michihi 満ち干 meaning "ebb and flow; high and low tides; the tides". Shiomitsu-tama 潮満珠 and shiohiru-tama 潮干珠 are archaic "tide jewel" names using shio or chō 潮 "tide; flow; salt water".
Read more about this topic: Tide Jewels