obsess

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obsess

(əb-sĕs′, ŏb-)
v. ob·sessed, ob·sessing, ob·sesses
v.tr.
To preoccupy the mind of (someone) excessively.

ob·ses′sor n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
References in periodicals archive ?
"In an ironic way, nature balances the situation when the thing obsessed turns on and bites the obsessor."
Pick of week The obsession with crime is explored in both US episodes, with obsessors of infamous serial killers Charles Manson and Jeffrey Dahmer interviewed as Farrier tries to wrap his head around the obsession.
INTRUSIVE THOUGHTS - sufferers are sometimes referred to as 'obsessors' or 'ruminators'