Also found in: Dictionary, Thesaurus, Financial, Acronyms, Idioms, Encyclopedia, Wikipedia.


1. A fissure.
Farlex Partner Medical Dictionary © Farlex 2012


Substance abuse A 'free-base' form of cocaine which, when smoked in a pipe, produce a brief, very intense 'high'. See Bingeing, Cocaine, Crack 'smile. ', Free base cocaine.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


1. A fissure.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


A highly purified form of COCAINE which produces an intense reaction of rapid onset. Crack is inherently more dangerous than less concentrated forms and deaths have resulted from its use.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


A fissure.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about crack

Q. what causes the sound of cracking noises in the head all the time it was said i had acute sinusitis but honestly i think it is more . I don't know why i have cracking noises in my head . I am very concerned about this also my neck is always stiff feeling and aching all the time. . My eyes are very tired and i see blue spots and they hurt behind the eye very badly . I have headaches very often

A. wow...that really sounds serious...i have chronic sinusitis and i can tell you i had horrible headaches but nothing like you describe now. i would strongly consider going to a hospital and checking it out...
tell us what was the result!

Q. anyone knows how to stop hard skin on the feet from becoming cracked??? during summer my feet got lots of hard skin and in the heel area the skin actually got cracked kinda deep. it hurts now and the cracks are starting to get infected I guess... do u guys know how to solve this?? I know there are some creams for that but I thought maybe now it's too late for that and I need something stronger?

A. There are good creams for moisterizing the skin of your feet on a daily basis, however now that you feel they might be infected you should see a dermatologist for some better treatment.

Q. Im only 17 I have horrble lower back pains. Im constitly rubbing,stretching, or cracking my back. the pain is either a throbbing pain or an ache or sting.I feel it worse when I put my chest out my shoulders back. my back feels like its out of place.

A. Lower back pain is so very common... I have had it for years, and just recently what I found to be very helpful is walking. Even a 30-45 minute walk and then some streching is good. I have hardly had any pain since I started exercising and it feels really good. Swimming is also known to help.

More discussions about crack
This content is provided by iMedix and is subject to iMedix Terms. The Questions and Answers are not endorsed or recommended and are made available by patients, not doctors.
References in periodicals archive ?
Cracks are often the result of settling, which usually happens with a newer house.
Yesterday, parts of the road linking Bayan Lepas to Balik Pulau were cracked after a heavy bout of rain and the side lane has since been closed to traffic.
The researchers studied 57 cities where crack arrived between 1982 and 1994.
Across the globe, weather, extended use, earth movement and time all cause cracks to form in cement based structures.
As shown in Figure 1, for a crack with a length of 2a inside an infinite plate in the plane, the model was subjected to an axial pressure of ax and a confining pressure of [[sigma].sub.3]; the angle between crack surface and axial stress is the internal cohesion of the crack is [c.sub.w]; the internal friction angle is [[psi].sub.w]; the internal cohesion of rock is c; and the internal friction angle of rock is [psi] [25].
Based on the partition of the unity method, the XFEM displacement formula can be derived by introducing an additional function which reflects the local characteristic of the crack on the basis of the conventional FEM displacement mode.
There have also been numerous studies on predicting the influence of FPZ (Xu, Wu, Zheng, Zhao, & Liu, 2011; Wu, Rong, Zheng, & Xu, 2011; Guo, Su, & Young, 2012) and on flexural crack using different methods.
These results show that cracks appeared in one of the solid block while the other sample is crack free having same dimensions.
A panel of dimension 100 X 100 mm is considered for analysis with a hole of diameter 10mm to simulate the effect of damages like dents, cracks, gouges and scratches critical being the crack, thickness of the panel is 20mm.
When this crack eventually spreads across the entire ice shelf, it will form a massive iceberg- approximately the size of Delaware, NASA scientists say.
For the thermal loading, the antisymmetrical linear heat flow is acting on the crack surfaces; namely,