apheresis

apheresis
[əˈfɪərɪsɪs]
noun
[mass noun]

(Linguistics)omission of the initial sound of a word, as when he is is pronounced he's
(语言学)词首音脱落
(Medicine)a technique by which a particular substance or component is removed from the blood, the main volume being returned to the body
(医)单采血液成分法，提取法，分离性输血

语源

mid 16th cent.: via late Latin from Greek aphairesis, from aphairein 'take away', from apo 'from' + hairein 'take'