Definition of "claustrophobic"

Using her hands like windshield wipers, she tried to flick snow away from her mouth. When she clawed at her chest and neck, the crumbs maddeningly slid back onto her face. She grew claustrophobic.

2012, John Branch, “Snow Fall : The Avalanche at Tunnel Creek”, in New York Time‎

...within the monstrous arrangements of dried flowers on the table-tops, against the Victorian clutter of that claustrophobic room...

1994, Elizabeth George, Playing for the Ashes