adiadochokinesia

[ad-ee-ad-uh-koh-ki-nee-zhuh, -zhee-uh, -zee-uh, -kahy-nee-]

noun Medicine/Medical.

the inability to perform rapidly alternating muscular movements, as flexion and extension.

Also, ad·i·ad·o·cho·ki·ne·sis

[ad-ee-ad-uh-koh-ki-nee-sis, -kahy-nee-] , ad·i·ad·o·ko·ki·ne·sia, ad·i·ad·o·ko·ki·ne·sis.

Origin:
a-⁶ + Greek diádocho(s) successor (dia- dia- + doch-, variant stem of déchesthai to receive + -os adj. suffix) + -kinesia

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Adiadochokinesia is always a great word to know.

So is umbilicus. Does it mean:

a bone in the human leg extending from the pelvis to the knee, that is the longest, largest, and strongest in the body; thighbone.

the depression in the center of the surface of the abdomen indicating the point of attachment of the umbilical cord to the embryo; navel.

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ad·i·ad·o·cho·ki·ne·sia