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καμπτικόν

From LSJ

Δῶς μοι πᾶ στῶ καὶ τὰν γᾶν κινάσωGive me a place to stand on, and I will move the Earth.

Archimedes

Russian (Dvoretsky)

καμπτικόν: τό сгиб, сочленение (δακτύλου Arst.).