\Roll"er\, n.
1. One who, or that which, rolls; especially, a cylinder,
   sometimes grooved, of wood, stone, metal, etc., used in
   husbandry and the arts.
2. A bandage; a fillet; properly, a long and broad bandage
   used in surgery.
3. (Naut.) One of series of long, heavy waves which roll in
   upon a coast, sometimes in calm weather.
4. A long, belt-formed towel, to be suspended on a rolling
   cylinder; -- called also {roller towel}.
5. (Print.) A cylinder coated with a composition made
   principally of glue and molassess, with which forms of
   type are inked previously to taking an impression from
   them. --W. Savage.
6. A long cylinder on which something is rolled up; as, the
   roller of a man.
7. A small wheel, as of a caster, a roller skate, etc.
8. (Zo["o]l.) ANy insect whose larva rolls up leaves; a leaf
   roller. see {Tortrix}.
9. [CF. F. rollier.] (Zo["o]l.) Any one of numerous species
   of Old World picarian birds of the family {Coraciad[ae]}.
   The name alludes to their habit of suddenly turning over
   or ``tumbling'' in flight.
Note: Many of the species are brilliantly colored. The common
      European species ({Coracias garrula}) has the head,
      neck, and under parts light blue varied with green, the
      scapulars chestnut brown, and the tail blue, green, and
      black. The broad-billed rollers of India and Africa
      belong to the genus {Eurystomus}, as the oriental
      roller ({E. orientalis}), and the Australian roller, or
      dollar bird ({E. Pacificus}). The latter is dark brown
      on the head and neck, sea green on the back, and bright
      blue on the throat, base of the tail, and parts of the
      wings. It has a silvery-white spot on the middle of
      each wing.
10. (Zo["o]l.) Any species of small ground snakes of the
    family {Tortricid[ae]}.
{Ground roller} (Zo["o]l.), any one of several species of
   Madagascar rollers belonging to {Atelornis} and allied
   genera. They are nocturnal birds, and feed on the ground.
{Roller bolt}, the bar in a carriage to which the traces are
   attached; a whiffletree. [Eng.]
{Roller gin}, a cotton gin inn which rolls are used for
   separating the seeds from the fiber.
{Roller mill}. See under {Mill}.
{Roller skate}, a skate which has small wheels in the place
   of the metallic runner; -- designed for use in skating
   upon a smooth, hard surface, other than ice.