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agoraphobia
This term describes a complex anxiety disorder that is frequently misunderstood as a simple fear of open spaces. In clinical and practical usage, the focus is on the perceived inability to escape or find safety, meaning the fear can manifest in crowded malls or public transport just as easily as in a wide-open field.
As a medical condition and an abstract state of anxiety, the word is treated as an uncountable noun. It does not have a plural form in standard usage, as it refers to the condition itself rather than individual instances of the disorder.
Meanings
An anxiety disorder characterized by a fear of being in situations where escape might be difficult or help wouldn't be available if things go wrong, often resulting in a fear of open spaces or crowded places.
Her agoraphobia became so severe that she could no longer leave her house without a companion.