xylograph
xylograph: n. a woodcut or wood-engraving (esp. an early one).

xylophagous
xylophagous: adj. (of an insect or mollusc) eating, or boring into, wood.

xanthic
xanthic: adj. yellowish. øxanthic acid any colourless unstable acid containing the -OCS[2]H group. [Gk xanthos yellow]