English edit

Etymology edit

treat +‎ -er

Noun edit

treater (plural treaters)

  1. One who or that which treats.
    • 2014, Martin Fleishman, The Casebook of a Residential Care Psychiatrist, page 58:
      I don't know why I do things like that except that sometimes I think that the principal difference between the treater and the treatee is that the treater is in possession of the keys, if only in a symbolic sense []
  2. A vessel used to treat oil-water emulsions by any of several mechanisms so that the oil can be accepted by the pipeline or transport.

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