Crossword clues for the word: ICOSA The word ICOSA has appeared as an answer to at least 8 crossword clues on different crossword puzzles. Crossword clues for ICOSA Showing 1 to 8 of 8 results Clue(s) "It means ""twenty"" in combos" "Prefix meaning ""20"" (anagram of CASIO)" "Prefix meaning ""twenty""" "Word form for ""twenty""" Prefix meaning 20 Prefix on -hedron Twenty: Prefix Twice deca-