projection
A meatus is an opening; therefor, it's a depression, not a projection.
projection
projection
projection
....opening?
is a depression
"A crest is a projection or ridge, especially of bone; cresta"source: chacha.com
projection. The bumps of bone around your knees and elbows are almost all called condyles.
They are opposites. A depression in a bone is a dent or superficial hole, a process is a projection that stick out.
The cup-shaped depression on the hip join that receives head of the femur is the acetabulum.
maniac is a serious type of depression the other is voices inside your head