noun
fulcrum peg (of a traditional oarlock)
Rare technical term for the peg fitted into the cavity of an oar, used in a traditional Japanese oarlock (see 櫓杭).
See also: 櫓杭
櫓臍は、和船の櫓を支える重要な部品である。
The fulcrum peg is an important part that supports the oar of a traditional Japanese boat.
櫓杭 is the oarlock post or pin, while 櫓臍 is specifically the fulcrum peg that fits into the oar's cavity.
Compound of 櫓 (ro, 'oar') and 臍 (heso, 'navel'), referring to the peg's navel-like shape and function. The exact historical derivation is uncertain.