center of buoyancy

/S EH1 N T ER0 AH0 V B OY0 AH0 N S IY0/
noun
  1. 1

    The point through which the resultant of all buoyant forces on an immersed hull are assumed to act; the centre of mass of the displaced water.

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Source: https://en.wiktionary.org/wiki/center%20of%20buoyancy, https://en.wiktionary.org/wiki/centre%20of%20buoyancy