Definition of acrostic noun from the Oxford Advanced American Dictionary

 

acrostic

 noun
noun
NAmE//əˈkrɔstɪk//
 
, NAmE//əˈkrɑs‑//
 
 
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a poem or other piece of writing in which particular letters in each line, usually the first letters, can be read downward to form a word or words
See the Oxford Advanced Learner's Dictionary entry: acrostic