the usage of "or"

[Anonymous]

hello,

my question is that in the following usage of the word "or," do we always need a comma before " or"

acrophobia, or fear of great heights. :)

[RonBee]

hello,

my question is that in the following usage of the word "or," do we always need a comma before " or"

acrophobia, or fear of great heights. :)

Oh, yes. If you didn't have the comma there it would suggest that acrophobia and fear of great heights might be two different things.

:)