What's the difference between rudderpost and rudderstock?

Rudderpost

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Definition:

• (n.) The shank of a rudder, having the blade at one end and the attachments for operating it at the other.

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Rudderstock

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Definition:

• (n.) The main part or blade of the rudder, which is connected by hinges, or the like, with the sternpost of a vessel.

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