In anatomy terms the difference between coxal and coxa
is that
coxal is sciatic (relating to the hip while
coxa is the basal segment of a limb of various arthropods (insects and spiders, for example).
As an adjective coxal
is sciatic (relating to the hip.
As a noun coxa is
the basal segment of a limb of various arthropods (insects and spiders, for example).