Definition of acrostic noun from the Oxford Advanced Learner's Dictionary

 

acrostic

 noun
noun
BrE BrE//əˈkrɒstɪk//
 
; NAmE NAmE//əˈkrɔːstɪk//
 
, NAmE//əˈkrɑːstɪk//
 
Poetry
 
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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 downwards to form a word or words See related entries: Poetry Word Origin late 16th cent.: from French acrostiche, from Greek akrostikhis, from akron ‘end’ + stikhos ‘row, line of verse’. The change in the ending was due to association with -ic.
See the Oxford Advanced American Dictionary entry: acrostic