Originally Posted By: etaoin
agoraphobia |ˌagərəˈfōbēə|
noun
extreme or irrational fear of crowded spaces or enclosed public places.
DERIVATIVES
agoraphobic |-ˈfōbik| adjective & noun
agoraphobe |ˈagərəˌfōb| noun
ORIGIN late 19th cent.: from Greek agora ‘place of assembly, marketplace’ + -phobia .

What dictionary is that from, eta?

AHD has "An abnormal fear of open or public places. Even the B&M OED has it as the fear of squares or open spaces with no mention of people or crowds.