An irrational fear of gravity or of heavy objects; or more commonly, extreme anxiety about weight or pressure.
From Greek baro- (meaning weight, from baros) combined with -phobia (Greek for fear, from phobos). The phobia combines two ancient Greek roots into a modern psychological term.
Barophobia is rare in clinical use, but it perfectly demonstrates how English creates phobia names—just grab any root (gravity, heights, spiders) and slap -phobia on it, and you've got an instant fear disorder!
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