-ktik- noun
Etymology: reduct ion + -ic
: a crystalline enolic ketone C 5 H 6 O 3 that has properties both of an acid and a strong reducing agent in alkaline solution and is formed by the action of dilute sulfuric acid on various carbohydrates at high temperature or synthetically from cyclopentanone; 2, -3-dihydroxy-2-cyclopenten-one