Of or relating to an apophysis; describing structures or processes involving small projections or outgrowths on bones.
From apophysis plus the suffix -eal (relating to). This is the standard anatomical adjective used in medical and scientific literature to describe bone features.
Your vertebrae have apophyseal joints that let your spine bend and twist—they're the reason you can touch your toes or do a backbend, and damage to these joints is what causes many people's back problems.
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