pancake

pancake /ˈpænˌkeɪk/ noun
plural pancakes
pancake
/ˈpænˌkeɪk/
noun
plural pancakes
Britannica Dictionary definition of PANCAKE
[count]
1 
: a thin, flat, round cake that is made by cooking batter on both sides in a frying pan or on a hot surface (called a griddle)
— see also potato pancake
2 
: thick makeup worn especially by actors
— called also pancake makeup

(as) flat as a pancake

— see 1flat