definition of
Y

[1] #1 Y n. [yttrium, atomic number 39] a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys. wn

[2] #2 Y n. [y, wye] the 25th letter of the Roman alphabet. wn

[3] #3 Y n. [y, wye] the 25th letter of the Roman alphabet. wn