xylographie (ksi-), n.f., xylography, wood-engraving.
xylographique (ksi-), adj., xylographic, of wood-engraving.
xyloïdine, n.f., (chem.) xyloidine.
xylophage (ksi-), n.m. and adj., (ent.) xylophagan; wood-fretter, bark-chafer; xylophagous.
xylophagie, n.f., xylophagy.
xylophone, n.m., (mus.) xylophone.
xyste (ksist), n.m., (antiq.) xyst, xystos.
Y
y (i-grèk), n.m., the twenty-fourth letter of the alphabet, y.