basis

basis /ba·sis/ (ba´sis) pl. ba´ses   [L.] the lower, basic, or fundamental part of an object, organ, or substance.

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ba·sis (bss)

n. pl. ba·ses (-sz)

The foundation upon which something, such as an anatomical part, rests.

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basis,

n the principal active ingredient in a prescription.

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basis

the lower, basic or fundamental part of an object, organ or substance, or the part opposite to or distinguished from the apex. See also base.