Etymology
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Words related to flexible

circumflex (n.)

"sign or mark placed over certain vowels to indicate accent or tone," 1570s, from Latin (accentus) circumflexus, "bent around," past participle of circumflectere "to bend around," of a charioteer, "turn around," from circum "around" (see circum-), + flectere "to bend" (see flexible).

Used as a loan-translation of Greek (prosodia) perispomenos (Dionysius of Halicarnassus), literally "drawn-around," with reference to the shape. The tone is recognized in Latin, Greek, and Sanskrit; in the first two it is limited to "long" vowels. "In modern English use the mark has no definite value, but is variously used by orthoepists or phonetists to mark long quantity, 'broad' quality, or the like" [OED].

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flex (v.)
1520s, "to bend," usually of muscles, probably a back-formation from flexible. Related: Flexed; flexing.
flexibility (n.)
1610s, of physical things, from French flexibilité (in Old French, "weakness, vacillation") or directly from Late Latin flexibilitatem (nominative flexibilitas), from Latin flexibilis "pliant, yielding" (see flexible). Of immaterial things from 1783.
flexion (n.)
c. 1600, "bent part," also, in grammar, "modification of part of a word," from Latin flexionem (nominative flexio) "a bending, swaying; bend, turn, curve," noun of action from past participle stem of flectere "to bend" (see flexible). Flection (18c.) is more recent, less etymological, but said to be more common in modern English, perhaps by influence of affection, direction, where the -ct- is in the Latin word. According to some modern dictionaries, flexion is "confined to anatomical contexts." Related: Flexional; flectional.
flexography (n.)
type of rotary printing technique, 1952, from combining form of flexible (in reference to the plate used) + -graphy in the literal sense.
flexor (n.)
1610s, of muscles, Modern Latin, agent noun from stem of Latin flectere "to bend" (see flexible). Alternative form flector attested from 1660s (see flexion).
flexuous (adj.)
"full of bends or curves, winding, sinuous," c. 1600, from Latin flexuosus, from flexus (n.) "a bending," from flectere "to bend" (see flexible). From 1620s as "undulating."
flexure (n.)
1590s, "action of flexing or bending," from Latin flextura, from flectere "to bend" (see flexible). From 1620s as "flexed or bent condition; direction in which something is bent." Picked up in mathematics (1670s), geology (1833).
genuflection (n.)

"act of bending the knee," especially in worship, early 15c., genu-fleccion, from Medieval Latin genuflectionem (nominative genuflexio) "bending of the knee," noun of action from past-participle stem of Late Latin genuflectere "genuflect," properly genu flectere "to bend the knee," from Latin genu "knee" (from PIE root *genu- (1) "knee; angle") + flectere "to bend" (see flexible).

inflect (v.)

early 15c., "to bend inward," from Latin inflectere (past participle inflexus) "to bend in, bow, curve," figuratively, "to change, alter, influence," from in- "in" (see in- (1)) + flectere "to bend" (see flexible). Grammatical sense "to vary by change of form" (especially at the end of a word) is from 1660s. Related: Inflected; inflecting.