Words related to flexible
"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].
"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).
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.