Flex

• POS: Noun, Verb (usu participle)

CIDE DICTIONARY

Flex, v. t. [L. flexus, p. p. of flectere to bend, perh. flectere and akin to falx sickle, E. falchion. Cf. Flinch.].

 To bend; as, to flex the arm.  [1913 Webster]

Flex, n. 

 Flax.  Chaucer.  [1913 Webster]

OXFORD DICTIONARY

Flex, v.
1 tr. & intr. bend (a joint, limb, etc.) or be bent.
2 tr. & intr. move (a muscle) or (of a muscle) be moved to bend a joint.
3 tr. Geol. bend (strata).
4 tr. Archaeol. place (a corpse) with the legs drawn up under the chin.

Flex, n. Brit. a flexible insulated cable used for carrying electric current to an appliance.

Etymology

abbr. of FLEXIBLE

THESAURUS

Flex

S-curve, arch, bend, bend back, bending, bow, bowing, cable, conflexure, contract, cord, crook, curl, curve, decurve, deflect, deflection, dome, embow, exercise, extension, flection, flexure, geanticline, geosyncline, give, hairpin turn, hook, hump, hunch, incurvate, incurve, inflect, inflection, lead, loop, meander, oxbow, recurve, reflect, reflection, reflex, retroflex, round, sag, stretch, swag, sweep, tense, tighten, turn, turning, vault, wind, wire

ROGET THESAURUS

Flex

Curvature

VB be curved curve, sweep, sway, swag, sag, deviate, curl, turn, reenter, render curved, flex, bend, curve, incurvate, inflect, deflect, scatter, refract (light), crook, turn, round, arch, arcuate, arch over, concamerate, bow, curl, recurve, frizzle, rotundity, convexity.

Elasticity

VB stretch, flex, extend, distend, be elastic, bounce, spring back.