Letters that make birefringence
b, e, f, g, n, c, r, i are letters that make 'birefringence'
Words within birefringence
fringe, gen, re, IR, ref, Inge, en, ng, RI, CE, in, ire, ring, IN, NC, Re, Bi, Ce, Fr, Ge, In, Ir, Fri are words within 'birefringence'