The Collaborative International Dictionary of English v.0.48:

Formica \For*mi"ca\ (f[^o]r*m[imac]"k[.a]), prop. n. [L., an
   ant.] (Zool.)
   A Linn[ae]an genus of hymenopterous insects, including the
   common ants. See Ant.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Formica \For*mi"ca\ (f[^o]r*m[imac]"k[.a]), prop. n. [a
   trademark.]
   A thermosetting plastic material composed of melamine resin,
   having good heat and chemical resistance, and commonly used
   as the surface layer in laminated sheets employed as
   coverings for counter tops, walls, or furniture.
   [PJC]

WordNet (r) 3.0 (2006):

Formica
    n 1: any of various plastic laminates containing melamine
    2: type genus of the Formicidae [syn: Formica, genus
       Formica]