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Webster 1913 Edition

Noun.

[L.

obtrectatio

, from

obtrectare

to detract from through envy. See

Slander; detraction; calumny.

[Obs.]

Barrow.

The objects of our senses

obtrude

their particular ideas upon our minds, whether we will or no.

Lock.

To offer with unreasonable importunity; to urge unduly or against the will.

Milton.

Noun.

[L. obtrectatio, from obtrecto; ob and tracto.]

Slander; detraction; calumny. [Little used.]

obtrectation ‎(plural obtrectations)

(obsolete) Disparagement, the belittling of someone or something; slander. [16th-18th c.]
- 1621, Robert Burton, The Anatomy of Melancholy, I.2.5.i:
  For as anger, fear, sorrow, obtrectation, emulation, etc. […] cause grievous diseases in the body, so bodily diseases affect the soul by consent.