in·trude

[in-trood] verb, in·trud·ed, in·trud·ing.
verb (used with object)
1.
to thrust or bring in without invitation, permission, or welcome.
2.
Geology. to thrust or force into.
3.
to install (a cleric) in a church contrary to the wishes of its members.
verb (used without object)
4.
to thrust oneself without permission or welcome: to intrude upon their privacy.
Origin:
1525–35; < Latin intrūdere to push in, equivalent to in- in-2 + trūdere to push

Related forms
in·trud·er, noun
in·trud·ing·ly, adverb
self-in·trud·er, noun
un·in·trud·ed, adjective
un·in·trud·ing, adjective
un·in·trud·ing·ly, adverb

Synonyms
4. interfere, interlope. See trespass.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To intruder
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Intruder is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a scrap or morsel of food left at a meal.
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Collins
World English Dictionary
intrude (ɪnˈtruːd) [Click for IPA pronunciation guide]
 
—vb (often foll by into, on, or upon)
1.  to put forward or interpose (oneself, one's views, something) abruptly or without invitation
2.  geology to force or thrust (rock material, esp molten magma) or (of rock material) to be thrust between solid rocks
 
[C16: from Latin intrūdere to thrust in, from in-² + trūdere to thrust]
 
in'trudingly
 
—adv

intruder (ɪnˈtruːdə) [Click for IPA pronunciation guide]
 
—n
a person who enters a building, grounds, etc, without permission

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Without hesitation, she challenged me, an intruder more than three times her
  height.
The quiet intruder that does not bombard our networks with useless traffic and
  in fact does not want to be noticed.
The strep provokes an antibody response that mistakes the sufferer's own heart
  muscle and valves for the strep intruder.
The mollusk instead coats the intruder with nacre, the secretion used to make
  its shell, forming a pearl.
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