Category: B

Conjunctivitis in which there is a sticky yellow discharge from the eye.  

The opening that forms as a result of invagination of the surface layer of the early embryo (gastrula). It is very much reduced in man, in which it gives rise to the archenteric canal. In the embryo of mammals, the small opening into the archenteron made by invagination of the blastula.  

Any zone of embryonic tissue that is still differentiating and growing into a particular organ. The term is sometimes applied to the tissue that develops into the kidneys and gonads. The undifferentiated cells from which the specialized tissues of organs are formed.  

A small widely distributed bloodsucking insect of the genus Simulium. Black flies are also known as buffalo gnats from their humpbacked appearance. Female flies can inflict painful bites and constitute a serious pest to man at certain times of the year. S. damnosum in Africa and S. ochraceum in Central America and Venezuela transmit the…

The poisonous gas containing carbon dioxide, carbon monoxide, or other suffocating material, sometimes found in pockets in underground workings.  

A basic aniline dye used for staining and counterstaining histological and bacterial specimens.  

The property possessed by some naturally occurring substances (such as cell membranes) of doubly refracting a beam of light, i.e. of bending it in two different directions.  

Describing a neuron (nerve cell) that has two processes extending in different directions from its cell body.  

A woman who has been pregnant twice and has giver birth to a living child at the end of each pregnancy. A woman who has given birth for the second time to an infant or infants, alive or dead, weighing 500 g or more. A woman who has experienced two distinct pregnancies and given birth…

One of the two swellings that develop in the roof of the midbrain during its development in the embryo.