Simple Definition of deer tick
: a very small insect found in the eastern U.S. and in Canada that usually feeds on deer and that can give the person or animal it bites various diseases (such as Lyme disease)
Full Definition of deer tick
: an ixodid tick (Ixodes scapularis syn. I. dammini) of the eastern United States and Canada that transmits the bacterium causing Lyme disease —called also black-legged tick
Medical Definition of deer tick
: a tick of the genus Ixodes (I. scapularis synonym I. dammini) that transmits the bacterium causing Lyme disease
Seen and Heard
What made you want to look up deer tick? Please tell us where you read or heard it (including the quote, if possible).