center of flotation
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center of flotation[′sen·tər əv flō′tā·shən]
In offshore oil operations, the geometric center of the water plane at which the mobile drilling rig floats and around which the rig rotates when it is subject to an external force without a change in displacement.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.