Definition of astragalus in US English:

astragalus

nounPlural astragali

Zoology
  • another term for talus
    • ‘Most of what I found were unidentifiable broken sections of long bones, but I did find a bird femur (thigh bone) and a nice rodent astragalus (ankle bone).’
    • ‘In the hind limb of these species, the bones of the ankle are also reduced in number, and the astragalus becomes the main weight-bearing bone.’
    • ‘Next to the pelvic bone was a much smaller bone, an astragalus (ankle bone), also of an elephant.’

Origin

Mid 16th century: via Latin from Greek astragalos ‘ankle bone, molding’, also the name of a plant.

Pronunciation

astragalus

/əˈstraɡələs//əˈstræɡələs/