Enclosed rhyme
Encyclopedia
Enclosed rhyme is the rhyme scheme
Rhyme scheme
A rhyme scheme is the pattern of rhyme between lines of a poem or song. It is usually referred to by using letters to indicate which lines rhyme. In other words, it is the pattern of end rhymes or lines...

 "abba" (that is, where the first and fourth lines, and the second and third lines rhyme). Enclosed-rhyme quatrain
Quatrain
A quatrain is a stanza, or a complete poem, consisting of four lines of verse. Existing in various forms, the quatrain appears in poems from the poetic traditions of various ancient civilizations including Ancient Greece, Ancient Rome, and China; and, continues into the 21st century, where it is...

s are used in introverted quatrains, as in the first two stanzas of Petrarchan sonnets.

Example

How soon hath Time, the subtle thief of youth,
Stolen on his wing my three and twentieth year!
My hasting days fly on with full career,
But my late spring no bud or blossom shew'th.

(From John Milton
John Milton
John Milton was an English poet, polemicist, a scholarly man of letters, and a civil servant for the Commonwealth of England under Oliver Cromwell...

's "On His Being Arrived to the Age of Twenty-Three")
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