definition.

the definition of scissors is stated by my friends over at dictionary.com as:
scis·sors [siz-erz] –noun

1.	(used with a singular or plural verb) a cutting instrument for paper, cloth, etc., consisting of two blades, each having a ring-shaped handle, that are so pivoted together that their sharp edges work one against the other (often used with pair of).

Origin: 1350–1400; ME cisoures, sisoures cisoires *cīsōria, pl. of LL cīsōrium cutting tool (see chisel); current sp. by association with L scindere to cut (ptp. scīssus), ML scīssor tailor

this from the Online Etymology Dictionary

scissors :

c.1384, sisoures, from O.Fr. cisoires (pl.) "shears," from V.L. *cisoria (pl.) "cutting instrument," from *cisus (in compounds such as L. excisus, pp. of excidere "to cutout"), ult. from L. cædere "to cut." In Scotland, shears answers for all sizes; but in England generally that word is used only for those too large to be worked by one hand. Spelling with sc- is 16c., from influence of M.L. scissor "tailor," from L. "carver, cutter," from pp. stem of scindere "to split." Sense in wrestling is from 1904. The verb scissor "to cur with scissors" is recorded from 1612; in the wrestling sense it is attested from 1968.