The terms crenation, poikilocytosis, and anisocytosis all refer to

The terms crenation, poikilocytosis, and anisocytosis all refer to cell shapes.

All these cell shapes can be seen under a microscope.

Anisocytosis are cells with unequal size.

Poikilocytosis are abnormally shaped red blood cells.

Crenation cells have round-toothed or having a scalloped edge