Definition of "agoraphobic"

[…] spaces horizontal and sparsely inhabited had always induced in him a depression accompanied by agoraphobic sensations.

1966, Truman Capote, In Cold Blood‎, New York: Random House, Part 1, p. 49

[My mother] and I had been distant for decades not because she was agoraphobic but because I'd been remote and unsparing.

2003, Lionel Shriver, We Need to Talk about Kevin‎, London: Serpent’s Tail, page 130