basal disk

noun Anatomy.

the flattened basal surface by which coelenterate polyps attach to the substrate.

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Also called pedal disk.

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Basal disk is always a great word to know.

So is middle ear. Does it mean:

the middle portion of the ear, consisting of the tympanic membrane and an air-filled chamber lined with mucous membrane, that contains the malleus, incus, and stapes.

a natural division or groove in an organ, as in the brain

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