Category: A

A grade II astrocytoma, composed of cells with abundant cytoplasm and two or three nuclei.  

A cell that gives rise to an astrocyte. It develops from spongioblasts derived from embryonic neuroepithelium.  

Study of extraterrestrial life.  

An herbal remedy used in traditional Chinese medicine as an immune stimulant and as a  treatment for colds and flu.  

Surgical removal of the talus (astragalus).  

Congenital absence of the mouth.  

Without a mouth or oral aperture; as certain protozoa.  

An instrument for measuring astigmatism.  

Astigmatism in which the eye has greater refractive power in the horizontal than in the vertical meridian.  

Loss or reduction of motility of spermatozoa in semen; associated with infertility.