\Spec"u*la`tor\, n. [L., a spy, explorer,
investigator: cf. F. sp['e]culateur.]
One who speculates. Specifically:
(a) An observer; a contemplator; hence, a spy; a watcher.
    [Obs.] --Sir T. Browne.
(b) One who forms theories; a theorist.
          A speculator who had dared to affirm that the human
          soul is by nature mortal.            --Macaulay.
(c) (Com.) One who engages in speculation; one who buys and
    sells goods, land, etc., with the expectation of deriving
    profit from fluctuations in price.