Neuter noun · From a presumed derivative probably of the same as sphaira (a ball, "sphere", cf the feminine sphura, a hammer)
Neuter of a presumed derivative probably of the same as σφαῖρα sphaîra (a ball, "sphere"; compare the feminine σφῦρα sphŷra, a hammer); the ankle (as globular):—ancle bone.
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