What is one of the articular processes of a vertebra, of which there are usually four, two anterior and two posterior. See under Vertebra. -- Zyg`ap*o*phys"i*al, a called?

zygapophysis — One of the articular processes of a vertebra, of which there are usually four, two anterior and two posterior. See under Vertebra. -- Zyg`ap*o*phys"i*al, a. (Webster's 1913.)

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