Source : Webster's Revised Unabridged Dictionary (1913)

Macle \Ma"cle\, n. [L. macula a spot: cf. F. macle. Cf.
   {Mackle}, {Mascle}.] (Min.)
   (a) Chiastolite; -- so called from the tessellated appearance
       of a cross section. See {Chiastolite}.
   (b) A crystal having a similar tessellated appearance.
   (c) A twin crystal.