acrostic

 
Pronunciation: /əˈkrɒstɪk/

noun

  • a poem, word puzzle, or other composition in which certain letters in each line form a word or words.

Origin:

late 16th century: 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