Rhyme, likeness of the terminal sounds of words, frequently used in versification either at the end of a line of verse or within the line. Rhyme appeared only occasionally in classical Greek and Latin poetry; it was used more extensively later, in songs of the medieval Roman Catholic church. Rhyme was not established as a technique in English poetry until the 14th century. Since then not all styles of poetry have employed rhyme, but it has never fallen entirely into disuse. Rhyme functions as an element of rhythm, emphasizing poetic beat. There are three types of true rhymes: masculine rhymes, in which the final syllable of the word or line is stressed ("spring," "bring"); feminine rhymes, in which two consecutive syllables, the first of which is accented, are alike in sound ("certain," "curtain"); and triple rhymes, in which all three syllables of a word are identical ("flowery," "showery"). Words in which the vowel and the following consonants in a stressed syllable are identical in sound, even if spelled differently, are called perfect rhymes ("two" and "too," or "spring" and "bring"). In eye, or sight, rhyme the words look as if they rhyme, but do not: "move," "love." Slant, or oblique, rhyme uses words with an imperfect match of sounds. Within this category, consonance relies on the similarity of consonant sounds: "shift," "shaft"; assonance relies on the similarity of vowel sounds: "grow," "home." A pair of rhyming lines is called a couplet; three lines that rhyme are called a triplet. Traditional poetic forms have prescribed rhyming patterns; for example, sonnets usually follow the Italian rhyme scheme, abba abba cde cde, or the English rhyme scheme, abab cdcd efef gg. Blank verse is regular in meter but does not rhyme; free verse is irregular in meter and also does not rhyme. 
 
 
 
 

Reference:  "Poetry," Microsoft® Encarta® 98 Encyclopedia. © 1993-1997 Microsoft Corporation. All rights reserved.