un impacted


tightly or immovably wedged in.
Dentistry. noting a tooth so confined in its socket as to be incapable of normal eruption.
driven together; tightly packed.
densely populated or crowded; overcrowded: an impacted school district.

1675–85; obsolete impact adj. (< Latin impāctus past participle of impingere to fasten, cause to collide, strike, equivalent to im- im-1 + pag-, variant stem of pangere to drive in, plant firmly + -tus past participle suffix) + -ed2; see impinge

nonimpacted, adjective
unimpacted, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
impacted (ɪmˈpæktɪd)
1.  (of a tooth) unable to erupt, esp because of being wedged against another tooth below the gum
2.  (of a fracture) having the jagged broken ends wedged into each other

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

c.1600, "press closely into something," from L. impactus, pp. of impingere "to push into, dash against" (see impinge). Originally sense preserved in impacted teeth (1876). Sense of "strike forcefully against something" first recorded 1916. Figurative sense began with use
as a noun (1817, first in Coleridge) meaning "effect of coming into contact with a thing or person."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

impacted im·pact·ed (ĭm-pāk'tĭd)

  1. Wedged together at the broken ends. Used of a fractured bone.

  2. Placed in the alveolus in a manner prohibiting eruption into a normal position. Used of a tooth.

  3. Packed in or wedged in such a manner so as to fill or block an organ or a passage.

The American Heritage® Stedman's Medical Dictionary
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