Category: S

A compound formed by an element or a radical replacing another element or radical in a compound.  

Something that may be used in place of another.  

One part of a molecule substituted with another atom or group.  

The fibrous middle layer of the drum membrane.  

Unable to meet a generally accepted benchmark for quality.  

An addictive disorder of compulsive drug use. It is marked by a cluster of behavioral and physiological symptoms that indicate continual use of the substance despite significant related problems. Patients develop a tolerance for the substance and require progressively greater amounts to elicit the effects desired. In addition, patients experience physical and psychological signs and…

The part of the microscope below the stage by which attachments are held in place.  

The minimum amount of something essential for life (e.g., a subsistence diet).  

The gradual disappearance of symptoms or manifestations of a disease. The slow reduction in the intensity and presence of disease symptoms.  

Having the sound of a muffled whistle.