What's the difference between xylograph and xylography?

Xylograph

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Definition:

• (n.) An engraving on wood, or the impression from such an engraving; a print by xylography.

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Xylography

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Definition:

• (n.) The art of engraving on wood.
• (n.) The art of making prints from the natural grain of wood.
• (n.) A method pf printing in colors upon wood for purposes of house decoration.

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