obsessor

obsess

[uhb-ses]
verb (used with object)
1.
to dominate or preoccupy the thoughts, feelings, or desires of (a person); beset, trouble, or haunt persistently or abnormally: Suspicion obsessed him.
verb (used without object)
2.
to think about something unceasingly or persistently; dwell obsessively upon something.

Origin:
1495–1505; < Latin obsessus, past participle of obsidēre to occupy, frequent, besiege, equivalent to ob- ob- + -sid(ēre) combining form of sedēre to sit

obsessingly, adverb
obsessor, noun

abscess, obsess.


1. possess, control, haunt.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
obsess (əbˈsɛs)
 
vb
1.  (tr; when passive, foll by with or by) to preoccupy completely; haunt
2.  (intr; usually foll by on or over) to worry neurotically or obsessively; brood
 
[C16: from Latin obsessus besieged, past participle of obsidēre, from ob- in front of + sedēre to sit]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

obsess
c.1500, "to besiege," from L. obsessus, pp. of obsidere "besiege, occupy," lit. "sit opposite to," from ob "against" + sedere "sit." Of evil spirits, "to haunt," is from 1530s.
Online Etymology Dictionary, © 2010 Douglas Harper
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