erythrocyte

2. A mature red blood cell lacking a nucleus, as found in mammals.

Under the microscope, the mature erythrocyte appeared as a smooth, nucleus-free disc.

3. A cell of the erythroid lineage at any stage of development.

The lab counted each erythrocyte in the sample to assess red cell production.

4. In zoology, a red blood corpuscle in non-mammalian vertebrates, which may retain a nucleus.

The frog's erythrocyte still contained a visible nucleus.