Definition of Rainbow Flop in Poker

Rainbow refers to flop board textures that have all different suits on them. In other words, it implies that the flop is offering no flush draw possibilities.

So a K club, 7 spades, 2 hearts would be considered to be a “rainbow flop”. Or one could just say King Seven Deuce rainbow.

If on the turn, the last suit in the deck comes so each card is still a different suit, it is still considered a rainbow board.