A muscle or anatomical structure that has two bellies or fleshy parts separated by a tendon.
From Latin 'bi-' (two) + 'venter' (belly). First used in anatomy to describe muscles like the digastric muscle that appear to have two distinct muscular sections.
The digastric muscle in your jaw is a classic biventer—it has two separate muscle bellies connected by a tendon, and it's why you can do weird things like move your jaw in multiple directions.
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