Dictionary:

Alcaic

  (ăl-kā'ĭk)

Of, relating to, or being a verse form used in Greek and Latin poetry, consisting of strophes having four tetrametric lines.

Verse composed in strophes of four tetrametric lines.

[Late Latin Alcaicus, of Alcaeus, from Greek Alkaïkos, from Alkaios, Alcaeus.]

The noun has one meaning:

Meaning #1: verse in the meter used in Greek and Latin poetry consisting of strophes of 4 tetrametric lines; reputedly invented by Alcaeus
  Synonym: Alcaic verse