[on-bawrd, -bohrd, awn-]
On board usually means to be traveling on some vehicle. For example, Baby On Board. Compare with overboard.

Metaphorically, the term on-board is often used to refer to some piece of technology that is integrated in a moving vehicle, for example:

In computing, the term on board often refers to controllers or other devices that are integrated onto a motherboard, used in the metaphoric sense, as well as referring to them being physically on the circuit board.

In medical imaging the term On-Board Imager is partly synonymous with Image Guided Radiation Therapy (IGRT)

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