1.2.1　Prefix

A prefix appears at the beginning of a word and generally describes location，direction，type，quality，quantity，or intensity.By learning the commonly used medical prefixes，you can figure out the meanings of medical terms that may not be immediately familiar to you.For example，when the prefix dys-（meaning“poor or difficult”）is paired with-trophy（meaning“nourishment”），the resulting word is dystrophy，meaning“poor nourishment of tissue”.(https://www.daowen.com)