Troll, n.
 1. The act of moving round; routine; repetition.
 2. A song the parts of which are sung in succession; a catch; a round.
    Thence the catch and troll, while =\“Laughter, holding both his sides,” sheds tears to song and ballad pathetic on the woes of married life.\=   --Prof. Wilson.
 3. A trolley.
 Troll plate Mach., a rotative disk with spiral ribs or grooves, by which several pieces, as the jaws of a chuck, can be brought together or spread radially.

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