Definitions

1. noun

the longest and strongest bone in the body, extending from the hip joint to the knee.

“She broke her femur while skiing down the mountain.”

2. anatomy

the long bone of the thigh.

“The femur is a vital part of the human skeletal system.”

3. biology

the longest bone of the leg in many vertebrates.

“Birds and reptiles also have a femur as part of their skeletal system.”