fender (boat); bumper (dock/pier)
Nautical term for a protective cushion used to prevent damage when a vessel contacts a dock, pier, or another vessel. The cross-referenced term 防舷材 is a near-synonym.
See also: 防舷材
When the ship comes alongside the quay, they lower fenders to protect the hull.
At the port, fenders are placed between the vessel and the pier to absorb impact.
Compound of 防 (ぼう, 'defend/protect'), 舷 (げん, 'ship's side/gunwale'), and 物 (ぶつ, 'thing/object'). The reading ぼうげんぶつ follows standard on'yomi.