We have the word "forearm" — but what's the other half of the arm called by itself? Does it have a corresponding positional name?
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In anatomy, it is called the arm. “The term forearm is used in anatomy to distinguish it from the arm, a word which is most often used to describe the entire appendage of the upper limb, but in anatomy, technically, it means only the region of the upper arm, whereas the lower ‘arm’ is called the forearm.”¹
Otherwise, the term used by many people is the upper arm:
Dorland's Illustrated Medical Dictionary defines brachium as:
But as MetaEd states, it is also known as the upper arm or just arm.