A vocal, or sometimes a whispered, sound modified by resonance in the oral passage, the peculiar resonance in each case giving to each several vowel its distinctive character or quality as a sound of speech; -- distinguished from a consonant in that the latter, whether made with or without vocality, derives its character in every case from some kind of obstructive action by the mouth organs. Also, a letter or character which represents such a sound. See Guide to Pronunciation, // 5, 146-149.
My favorite rhymes are sort of half-rhymes where you might just get the vowel sound the same, but it's not really a true rhyme. That gives you far more flexibility to capture the feeling you're trying to express. But sometimes it's best not to have any rhyme. Conor Oberst
Some people with autism who don't talk, all they hear are vowel sounds. Like if I said 'cup,' they might just hear 'uh.' Temple Grandin
My family is from Liverpool, so I have some of those vowel sounds, I've got the slack tone of someone from Birmingham, and then I was raised in Bedford, which is just north of London. So my accent, if it's possible, makes even less sense to a Brit than to an American. John Oliver