hyperflex

From hyper- +‎ flex?

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hyperflex (plural hyperflexes)

1. (geometry) A point of a curve where the tangent line has contact of order at least 4.

hyperflex (third-person singular simple present hyperflexes, present participle hyperflexing, simple past and past participle hyperflexed)

1. (anatomy) To flex beyond the normal range of motion.