TheThesaurus is aSlimosaur that servesBowser inDinosaur Dilemma. Its name is a pun on "thesaurus," which describes a collection of synonymous terms, and "-saurus," a common suffix for dinosaurs. It attacksMario andYoshi with a group of other Slimosaurs after the former two defeat theTimes-Square-atops. The Thesaurus is described as resembling the shape of a bookcase (as thesauri are often published as books) and knowing 367 ways of attacking. If Mario has aStarman, he uses it to dash between the Thesaurus's feet and avoid its attacks. Yoshi, meanwhile, is eating the nails off a spice rack until it falls, causing a cloud of chili pepper to envelop the room; the Thesaurus soon starts sneezing before violently exploding. The room's occupants are then coated in yellow-and-green dino-goo, includingGary Koopa,C. Everett Koopa,Francis Ford Koopola,James Fennimore Koopa, and the rest of the Snowbell Prize committee, who entered the room after hearing the commotion. If Mario does not have a Starman, the Thesaurus relentlessly beats him up (while the narration uses a variety of words to describe the action, as per a thesaurus's use) until aGame Over occurs.

• Dinosaurs
• Dinosaur Dilemma characters