Author: Glossary

Fertilization by a single spermatozoon entering an ovum.  

Spasm of a single limb or part. A contraction of one muscle or a set of muscles.  

An unpaired sex chromosome, X or Y, sometimes called an accessory chromosome.  

Having a single nose, as in conjoined twins.  

Condition in which there is only one descended testicle.  

Condition of having only one foot; usually the two feet are fused.  

Made up of a single substance or tissue.  

Having a single, permanent set of teeth.  

The hypothesis that all blood cells are derived from a single stem cell.  

Abnormal fear of being alone.