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Webster 1913 Edition

Noun.

[L.]

One who ruminates or muses; a meditator.

Noun.

One that ruminates or muses on any subject; one that pauses to deliberate and consider.

ruminator ‎(plural ruminators)

One who ruminates; one who meditates or reflects.
- 2009, January 25, “Maria Russo”, in Unhappy Together:
  The narrator is a reader and ruminator, a provocateur.

rūminātor