gray ooze, n., D&Dism in AD&D, a monster similar to a Black Pudding. See making gray ooze.
Addendum: "Slimes are gelatinous monsters that are mostly a modern invention. Slimes were most popularized in a sci-fi horror movie called The Blob, directed by Irvin Yeaworth. The Blob, originally released in 1958, was about a massive red slime that grew quickly by devouring people. Dungeons and Dragons has several types of slimes, such as black puddings, ochre jellies, gray ooze, slithering trackers, green slime, olive slime, and slime creatures. All are amorphous except slime creatures. Most of the amorphous slimes attack people by devouring their armor and either absorbing their fluids or eating them. Slime creatures are people who have been devoured and replaced by alive slime. In Japan, slimes have been popularized by Dragon Quest. The original slimes were shiny blue onion-shaped monsters with a huge face. Instead of just slithering to get around, they often bounce for quicker movement." -- from "The Bestiary of Modern Fantasy" by James Gray. [GJ1]