in·va·sive

[in-vey-siv]
adjective
1.
characterized by or involving invasion; offensive: invasive war.
2.
invading, or tending to invade; intrusive.
3.
Medicine/Medical. requiring the entry of a needle, catheter, or other instrument into a part of the body, especially in a diagnostic procedure, as a biopsy.
Origin:
1400–50; late Middle English < Medieval Latin invāsīvus. See invasion, -ive

Related forms
un·in·va·sive, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
invasive (ɪnˈveɪsɪv) [Click for IPA pronunciation guide]
 
—adj
1.  of or relating to an invasion, intrusion, etc
2.  relating to or denoting cancer at the stage at which it has spread from its site of origin to other tissues
3.  (of surgery) involving making a relatively large incision in the body to gain access to the target of the surgery, as opposed to making a small incision or gaining access endoscopically through a natural orifice

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

invasive in·va·sive (ĭn-vā'sĭv)
adj.

  1. Marked by the tendency to spread, especially into healthy tissue, as a tumor.

  2. Of or relating to a medical procedure in which a part of the body is entered, as by puncture or incision.

in·va'sive·ness n.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
invasive   (ĭn-vā'sĭv)  Pronunciation Key 

    1. Relating to a disease or condition that has a tendency to spread, especially a malignant cancer that spreads into healthy tissue.

    2. Relating to a medical procedure in which a part of the body is entered, as by puncture or incision.

  2. Not native to and tending to spread widely in a habitat or environment. Invasive species often have few natural predators or other biological controls in their new environment. Although not always considered harmful to an environment, invasive species can become agricultural or ecological pests and can displace native species from their habitats. Invasive species are often introduced to an environment unintentionally, as the zebra mussel was to the Great Lakes, but are sometimes introduced for a purpose, as kudzu was to the southern US, where it was originally planted to control erosion.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Spread by creeping rhizomes and can be invasive if not controlled.
Planned invasive plant that is what those paper companies are set to do.
Once established, the plant is vigorous, possibly even invasive add to my plant
  list.
Sure, with the proper social filters, location awareness needn't be invasive or
  creepy.
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