Acrostic

A·cros·tic

Acrostic

n.
  1. A composition, usually in verse, in which the first or the last letters of the lines, or certain other letters, taken in order, form a name, word, phrase, or motto.
  2. A Hebrew poem in which the lines or stanzas begin with the letters of the alphabet in regular order (as Psalm cxix.). See Abecedarian.

Phrases & Compounds
Double acrostic
a species of enigma<-- crossword puzzle -->, in which words are to be guessed whose initial and final letters form other words.

Acrostic

n.
  1. Pertaining to, or characterized by, acrostics.