noun, masculine

plongeoir

/plɔ̃.ʒwaʁ/

noun, masculine/plɔ̃.ʒwaʁ/plural: plongeoirs

diving board, springboard (diving board consisting of a flexible, springy, cantilevered platform, used for diving into water)

From plonger + -oir.

plongeoir — French Dictionary | Passage