Key: "S:" = Show Synset (semantic) relations, "W:" = Show Word (lexical) relations
Display options for sense: (gloss) "an example sentence"
Noun
S: (n) chemical reaction, reaction ((chemistry) a process in which one or more substances are changed into others) "there was a chemical reaction of the lime with the ground water"
S: (n) reaction (an idea evoked by some experience) "his reaction to the news was to start planning what to do"
S: (n) reaction, response (a bodily process occurring due to the effect of some antecedent stimulus or agent) "a bad reaction to the medicine"; "his responses have slowed with age"
S: (n) automatism (any reaction that occurs automatically without conscious thought or reflection (especially the undirected behavior seen in psychomotor epilepsy))
S: (n) rebound (a reaction to a crisis or setback or frustration) "he is still on the rebound from his wife's death"
S: (n) overreaction (an excessive reaction; a reaction with inappropriate emotional behavior)
S: (n) immune response, immune reaction, immunologic response (a bodily defense reaction that recognizes an invading substance (an antigen: such as a virus or fungus or bacteria or transplanted organ) and produces antibodies specific against that antigen)
S: (n) cell-mediated immune response (an immune response (chiefly against viral or fungal invasions or transplanted tissue) that involves T cells)
S: (n) complement fixation (an immune response in which an antigen-antibody combination inactivates a complement (so it is unavailable to participate in a second antigen-antibody combination))
S: (n) tropism (an involuntary orienting response; positive or negative reaction to a stimulus source)
S: (n) Babinski, Babinski reflex, Babinski sign (extension upward of the toes when the sole of the foot is stroked firmly on the outer side from the heel to the front; normal in infants under the age of two years but a sign of brain or spinal cord injury in older persons)
S: (n) yawn, yawning, oscitance, oscitancy (an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom) "he could not suppress a yawn"; "the yawning in the audience told him it was time to stop"; "he apologized for his oscitancy"
S: (n) electric shock, electrical shock, shock (a reflex response to the passage of electric current through the body) "subjects received a small electric shock when they made the wrong response"; "electricians get accustomed to occasional shocks"
S: (n) light reflex, pupillary reflex, miosis, myosis (reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller)
S: (n) mydriasis (reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs)
S: (n) micturition reflex (relaxation of the urethral sphincter in response to increased pressure in the bladder)
S: (n) pharyngeal reflex, gag reflex (normal reflex consisting of retching; may be produced by touching the soft palate in the back of the mouth)
S: (n) plantar reflex (flexion of the toes when the sole of the foot is stroked firmly on the outer side from the heel to the front in persons over the age of 2 years; under 2 years the results should be extension of the toes (Babinski reflex))
S: (n) rooting reflex (reflex consisting of head-turning and sucking movements elicited in a normal infant by gently stroking the side of the mouth or cheek)
S: (n) startle response, startle reaction (a complicated involuntary reaction to a sudden unexpected stimulus (especially a loud noise); involves flexion of most skeletal muscles and a variety of visceral reactions)
S: (n) startle reflex, Moro reflex (a normal reflex of young infants; a sudden loud noise causes the child to stretch out the arms and flex the legs)
S: (n) suckling reflex (reflex behavior in newborn mammals; includes finding and grasping the nipple in the mouth and sucking on it and swallowing the milk)
S: (n) hiccup, hiccough, singultus ((usually plural) the state of having reflex spasms of the diaphragm accompanied by a rapid closure of the glottis producing an audible sound; sometimes a symptom of indigestion) "how do you cure the hiccups?"
S: (n) passage, passing (a bodily reaction of changing from one place or stage to another) "the passage of air from the lungs"; "the passing of flatus"
S: (n) answer (a nonverbal reaction) "his answer to any problem was to get drunk"; "their answer was to sue me"
S: (n) transfusion reaction (reaction of the body to a transfusion of blood that is not compatible with its own blood; an adverse reaction can range from fever and hives to renal failure and shock and death)
S: (n) reaction ((mechanics) the equal and opposite force that is produced when any force is applied to a body) "every action has an equal and opposite reaction"
S: (n) reaction (a response that reveals a person's feelings or attitude) "he was pleased by the audience's reaction to his performance"; "John feared his mother's reaction when she saw the broken lamp"
S: (n) reaction (extreme conservatism in political or social matters) "the forces of reaction carried the election"
S: (n) reaction (doing something in opposition to another way of doing it that you don't like) "his style of painting was a reaction against cubism"