crus
UK[krʌs]US[krʌs]
n
The leg from the knee to the ankle; the shank.
n
Any of various parts of an animal or structure resembling a leg or shank.
Etymology
The word 'crus' entered English in the 17th century as a direct borrowing from Latin, where it meant "leg, shank." The Latin term is traced back to the Proto-Indo-European root kreu- or kreuh-, which conveyed the sense of "hard, solid body part," a root also related to the Greek word for "flesh." In English anatomical and zoological terminology, it retains its classical sense, specifically denoting the lower leg or any analogous supporting structure. Its journey from a general PIE concept of a solid limb to a precise scientific term illustrates the direct adoption of Latin vocabulary for specialized fields.
Analysis
The word 'crus' is a simplex noun borrowed directly from Latin. It functions as a single, unanalyzable morpheme in modern English.
Examples
The MRI revealed a stress fracture in his left crus.
In insects, the crus is a segment of the leg between the femur and the tarsus.
The statue stood on a marble crus shaped like a lion's leg.