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hypokalemia
hypolimnion
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hypotenuse

hy·pot·e·nuse [ hī pótt'n ss ] (plural hy·pot·e·nuses)


noun 
Definition:
 
longest side of right triangle: the longest side of a right triangle, opposite the right angle

[Late 16th century. Via Latin hypotenusa< Greek hupoteinousa "(line) stretching under (the right angle)" < present participle of hupoteinein "stretch under" < teinein "stretch"]
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