obsess Meaning, Definition & Usage

  1. noun a major river of western Siberia; flows generally northward and westward to the Gulf of Ob and the Kara Sea
    Ob River; Ob.
  2. noun the branch of medicine dealing with childbirth and care of the mother
    tocology; midwifery; OB; obstetrics.
  3. verb haunt like a ghost; pursue
    ghost; haunt.
    • Fear of illness haunts her
  4. verb be preoccupied with something
    • She is obsessing over her weight

WordNet

Ob*sess" transitive verb
Etymology
L. obsessus, p.p. of obsidere to besiege; ob (see Ob-) + sedere to sit.
Definitions
  1. To besiege; to beset. Sir T. Elyot.

Webster 1913