Y's

noun pl. Y's, y's

1. the twenty-fifth letter of the English alphabet: from the Greek upsilon
2. any of the speech sounds that this letter represents, as, in English, the semivowel (y) at the beginning of a syllable, as in yes or beyond, or the vowel (i) of myth, (ē) of holy, or (ī) of my
3. a type or impression for y or Y
4. the twenty-fifth in a sequence or group
5. an object shaped like

adjective

1. of y or Y
2. twenty-fifth in a sequence or group
3. shaped like