phantasmnounphan·tasm something that a person sees in his or her mindwhich sentence uses the word  phantasm  correctly, according to the dictionary entry? what he thought he saw in the upstairs window turned out to be a phantasm. remarkably, the phantasm returned all of her clothes to the closet. bianca wanted to phantasm the unpleasant thought permanently from her mind. the phantasm chased josé and carla into the street and cornered them in the alley.