aphaeresis

or a·pher·e·sis (ə-fĕr'ĭ-sĭs)
n., pl., -ses, or -ses (-sēz').
The loss of one or more sounds from the beginning of a word, as in till for until.

[Late Latin, from Greek aphairesis, from aphairein, to take away : apo-, apo- + hairein, to take.]

aphaeretic aph'ae·ret'ic (ăf'ə-rĕt'ĭk) adj.

(Greek, taking away) Taking away or abstracting from some feature or another. In Neoplatonism, abstracting from the lower to gain a conception of the highest being.

Any procedure in which blood is withdrawn from a donor, a portion (plasma, leukocytes, platelets, etc.) is separated and retained, and the remainder is retransfused into the donor. It includes leukapheresis, thrombocytapheresis, etc. Called also pheresis.

A type of elision in which a letter or syllable is omitted at the beginning of a word, as 'twas for it was.