What is the term used for the fear of crowds or open spaces resulting in feelings of loss of control and panic?

The term for the fear of crowds or open spaces, which can lead to feelings of loss of control and panic, is agoraphobia. This specific anxiety disorder is characterized by an intense fear of situations where escape might be difficult or help unavailable in case of a panic attack or embarrassing situation. Individuals with agoraphobia often avoid places like crowded areas, public transportation, or even leaving their homes altogether due to these pervasive fears.

In contrast, aerophobia refers to the fear of flying, ailurophobia is the fear of cats, and acrophobia is the fear of heights. While these fears can also induce anxiety, they are not specifically related to crowds or open spaces, thus distinguishing agoraphobia as the correct answer in this context.