–verb (used without object), verb (used with object), -gized, -giz⋅ing.
to argue or reason by syllogism.
Also, especially British, syl⋅lo⋅gise.
Origin: 1375–1425; late ME silogysen < LL syllogizāre < Gk syllogízesthai to reason, equiv. to syl-syl-+ logízesthai to reckon, infer, equiv. to lóg(os) discourse (see logos) + -izesthai-ize