Phlox \Phlox\, n. [L., a kind of flower, fr. Gr. ? flame, fr. ? to burn.] (Bot.) A genus of American herbs, having showy red, white, or purple flowers. {Phlox worm} (Zo["o]l.), the larva of an American moth ({Heliothis phloxiphaga}). It is destructive to phloxes. {Phlox subulata}, the moss pink. See under {Moss}.