- (rare) The irrational fear of subways and the underground in general.
- Bradley's bathysiderodromophobia prevents her from travelling easily.
1955, William Gaddis, The Recognitions: A novel, page 618:
- Bathysiderodromophobia! What did I tell you! said an onlooker. Anselm looked up, his eyes narrowed. —And what's that in your pocket?