In the dinosaurs, the lateral condyle of the femur is subdivided into two parts, here termed semicondyles: cranial semicondyle which articulates primarily with the fibula, and caudal semicondyle which is known in the theropods as the ectocondylar tuber and articulates with the tibia. Modern birds also have two semicondyles, fibular and tibiofibular (“tibiofibular crest”), which roughly correspond in position to the non-avian theropod semicondyles. However, the basal birds have a single rounded lateral condyle which must have undergone differentiation into two modern avian semicondyles independently of those in the non-avian theropods. Since extrapolating anatomical terms for details of the femoral lateral condyle between modern birds and theropods seems unwarranted, I propose to use two separate, consistent sets of terms, both based on the subdivision of the lateral condyle into two semicondyles, as implemented for modern birds in Table 1.