Category: S

The part of a prescription that contains directions for compounding ingredients.  

During pregnancy, the endometrium that lines the entire uterine cavity except at the site of the implanted blastocyst.  

In taxonomy, the category between a phylum and a class.  

Below accepted standards, said, e.g., of poor performance by an employee or institution.  

Very slightly papular, such as papules elevated scarcely more than macules.  

In a series of oxides, one that contains the smallest amount of oxygen.  

In taxonomy, a category between an order and a family.  

Beneath the neural axis or the central nervous system.  

Too minute to be seen through a microscope.  

A particle smaller than 10 -6 cm in diameter, visible only with an ultramicroscope. A tiny particle that can only be seen using an electron microscope.