1) Erythrocyte 2) Megalocyte 3) Red blood cell 1) Megalocyte 
(from the article `pernicious anemia`) ...These cells, called megaloblasts, are for the most part destroyed in the bone marrow and are not released to the circulation. Some megaloblasts ...
Noun: An abnormally large red blood cell found in the blood, especially in some forms of anaemia.
<haematology> Abnormally large red blood cell, numerous in pernicious anaemia. ... (27 Jan 1998) ... 
(mak´ro-sīt″) an abnormally large erythrocyte. adj., macrocyt´ic., adj.
Type: Term Pronunciation: mak′rō-sīt Definitions: 1. A large erythrocyte, such as those observed in pernicious anemia. Synonyms: macroerythrocyte
macrocyte 1. An abnormally large red blood cell, especially one associated with pernicious anemia. 2. An abnormally large erythrocyte; such as, those seen in macrocytic anemia; also known as a megalocyte.