Reflex

Noun

 * 1) An automatic response to a simple stimulus which does not require mental processing.
 * 2)  A corresponding phoneme in a daughter language.

Adjective

 * 1) Bent, turned back or reflected.
 * 2) Produced automatically by a stimulus.
 * 3)  Having greater than 180 degrees but less than 360 degrees.
 * 4) * 1878, James Maurice Wilson, Elementary Geometry, MacMillan, page 10:
 * A polygon is said to be convex when no one of its angles is reflex.
 * 1) * 1895, David Eugen Smith and Wooster Woodruff Bernan, New Plane and Solid Geometry, page 7:
 * An angle less than a right angle is said to be acute; one greater than a right angle but less than a straight angle is said to be obtuse; one greater than a straight angle but less than a perigon is said to be reflex or convex.
 * 1) * 1958, Howard Fehr, “On Teaching Dihedral Angle and Steradian” in The Mathematics Teacher, v 51, National Council of Teachers of Mathematics, page 275:
 * If the reflex region is the interior of the angle, the dihedral angle is reflex.
 * 1) * 1991, B. Falcidieno et al, “Configurable Representations in Feature-based Modelling” in Eurographics '91: Proceedings, North-Holland, page 145:
 * A reflex edge of a polyhedron is an edge where the inner dihedral angle subtended by two incident faces is greater than 180°.
 * 1) * 2001, Esther M. Arkin et al, “On the Reflexivity of Point Sets”, in Algorithms and data structures: 7th International Workshop, WADS 2001: Proceedings, Springer, page 195:
 * We say that an angle is convex if it is not reflex.
 * 1) * 2004, Ana Paula Tomás and António Leslie Bajuelos, “Quadratic-Time Linear-Space Algorithms Generating Orthogonal Polygons with a Given Number of Vertices”, in Computational Science and Its Applications – ICCSA 2004 Proceedings, part 3, Springer, page 117:
 * P denotes a polygon and r the number of reflex vertices.

Synonyms

 * re-entrant

Verb

 * 1) to bend, turn back or reflect
 * 2) to respond to a stimulus

Thesaurus
Pavlovian conditioning, action and reaction, adumbration, answer, antiphonal, arch, automatic, automatic reaction, automatic response, autonomic reaction, back, backlash, backward, backwash, behavior, bend, bend back, blind, blind impulse, bounceback, bow, brain wave, brainstorm, casual, clout, compulsive, conditioned, conditioned response, conditioning, counter, crook, curl, curve, decurve, deflect, dome, drive, echo, embow, fancy, flash, fleeting impulse, flex, force, forced, gut, gut response, hook, hump, hunch, ill-advised, ill-considered, ill-devised, impact, impress, impression, imprint, impulse, impulsive, inadvertent, incurvate, incurve, indeliberate, inflect, inspiration, instinct, instinctive, instrumental conditioning, involuntary, involuntary impulse, loop, mark, mechanical, natural impulse, negative reinforcement, notion, operant conditioning, outline, positive reinforcement, predictable response, print, psychagogy, quick hunch, reacting, reaction, reactionary, reactive, recoil, recurve, reeducation, reflect, reflection, reflex action, reflexive, refluence, refluent, reflux, reinforcement, reorientation, repercussion, reply, respondence, respondent, responding, response, responsive, retroaction, retroactionary, retroactive, retroflex, return, reverberation, reversed, revulsion, revulsive, rise, round, sag, shadow, silhouette, snap, spontaneous, sudden thought, swag, sweep, turn, turned around, unadvised, uncalculated, unconditioned reflex, unconscious, unconsidered, undeliberate, undeliberated, undesigned, unintended, unintentional, unmeditated, unpremeditated, unstudied, unthinking, unthinking response, unwilled, unwilling, unwitting, urge, vault, wind, wrong-way, wrong-way around

Etymology
From reflexus:, past participle of reflectere:.

Noun

 * Bulgarian:
 * Finnish: ,
 * French:


 * Italian:
 * Portuguese:
 * Russian: рефлекс

Noun

 * 1) a reflex, a (quick and spontaneous) reaction
 * 2) a reflector (tag, strip or band; carried by pedestrians and bicyclists to be visible from automobiles)