kind of pasta, 1660s, literally "little worms," from Italian vermicelli, plural of vermicello, diminutive of verme, accusative singular of Latin vermis "worm" (see worm (n.)). So called for resemblance.
"An aggregate of molecules in a colloidal solution, such as those formed by detergents", Late 19th century: coined as a diminutive of Latin mica 'crumb'.