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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.

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References in periodicals archive ?
The analytical method proposed in this paper provides a powerful tool for calculating the natural frequency of the beam with a breathing oblique crack. This method can be applied to beams with multiple breathing oblique cracks, and several double-linear-springs-models can be used to simulate the breathing behaviours of each oblique crack.
Cracks are often the result of settling, which usually happens with a newer house.
Chow said the road, Jalan Bukit Lama, was recently repaired so the contractor must investigate the cause of the cracks.
Cracks in cargo unit building have widened, offices to be shifted to a safer place on Monday, official says
The Torque Lock Staple has a unique method of application using a metal stitching to create a controlled compression to secure structural cracks with a stabilization that ensures the crack will not widen or spread, even with time.
It can be seen from (3) and (4), under the action of compressive stress and pore pressure, the microcracks can close, open, extend, or induce new cracks, and the prefabricated cracks are relatively sliding under the action of shear stress.
If the water pressure is large enough and the core wall has poor anticrack ability, cracks may occur at the point C.
Most transverse cracks initiated from the slab edge close to the shoulder, and two forms of longitudinal cracks can initiate from transverse edges of slabs: a single long crack or multiple short cracks along the whole section.
Here, the objective is to develop of an analytical method to calculate the effect of FPZ on shear cracks in RC beam based on the fictitious crack approach.
In the in-situ oil shale exploitation, the main method is that by injecting heat into the underground, thermal cracking in oil shale occurs and then cracks generate, which can induce industrial oil and gas flows.
During the fabrication process cracks produce at the surface of AAO non-planar membrane.
Damages, vend, dots, cracks are spoiled the fatigue life in aero industries.