COLLOID

noun Etymology: International Scientific Vocabulary coll- + -oid Date: circa 1852 a gelatinous or mucinous substance found normally in the thyroid and also in diseased tissue, 2. a substance that consists of particles dispersed throughout another substance which are too small for resolution with an ordinary light microscope but are incapable of passing through a semipermeable membrane, a mixture consisting of a ~ together with the medium in which it is dispersed , ~al adjective ~ally adverb