A small cavity or chamber located above or on top of a larger cavity, especially used in anatomical or zoological descriptions.
From Greek 'epi' (upon) + 'koila' (hollow or cavity). A technical term adopted in anatomy to describe secondary or superior hollow spaces within organisms.
Many ancient creatures had multiple coelas (cavities) in their skulls—epicoela helped reduce weight while maintaining strength, a engineering solution evolution discovered millions of years before humans.
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