hypsophobia en · NOUN
Etymology
From hypso- + -phobia.
Meanings
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(uncountable) Fear of heights.
Though I had more instructions, I was overcome by a huge dizzying wave of hypsophobia as I stared at him, his boots balanced on the narrow sill, his rear end dangling in outer space.
1967, Sue Kaufman, Diary of a Mad Housewife, page 94: