Grease is a type of oil or fat that is typically oily and thick at room temperature.
Here are some examples of how "greasy" is used in a denotative way:
* "The mechanic's hands were greasy from working on the car."
* "The frying pan was greasy after cooking bacon."
* "The hair on the pizza was greasy."
It's important to note that "greasy" can also have negative connotations, such as being unpleasant or unhealthy. However, those are connotations, not the denotation.