levan

lev·an

noun \ˈlev-ˌan\

Definition of LEVAN

: any of a group of levorotatory polysaccharides (C₆H₁₀O₅)_n composed of levulose units of the furanose type and formed especially from sucrose solutions by the action of various bacteria (as Bacillus subtilis or B. mesentericus)—compare dextran