Webster's English Dictionary

Enter the word to look up:

colloid

col.loid \'ka:l-.o.id\ \k*-'lo.id-*l, ka:-\ \-*l-e-\ n often attrib  1: a 
   substance that is in a state of division preventing passage through a  
   semipermeable membrane, consists of particles too small for resolution with 
   an ordinary light microscope, and in suspension or solution diffracts a 
   beam of light and fails to settle out; also : a system consisting of such a 
   substance together with the gaseous, liquid, or solid medium in which it is 
   dispersed 2: a gelatinous or mucinous substance found in tissues in disease 
   or normal ly (as in the thyroid) - col.loi.dal aj