1) Monocyte 
Monoblasts are normally found in bone marrow and do not appear in the normal peripheral blood. They mature into monocytes which, in turn, develop into macrophages. ==Structure== A typical monoblast is about 12 to 20 µm in diameter, has a nuclear to cytoplasm ratio of 4:1 to 3:1, and, like most myeloid blasts, has a round to oval nucleus with fine...
An immature cell that develops into a monocyte. ... Origin: mono-+ G. Blastos, germ ... (05 Mar 2000) ... 
(mon´o-blast) the earliest precursor in the monocytic series, which develops into the promonocyte.
Type: Term Pronunciation: mon′ō-blast Definitions: 1. An immature cell that develops into a monocyte.
[n] - a large immature monocyte normally found in bone marrow
noun a large immature monocyte normally found in bone marrow