Definitions

1. noun

Either of the two identical strands of DNA that make up a chromosome during mitosis or meiosis.

“During cell division, the sister chromatids separate and move to opposite poles of the cell.”

2. noun

One of the two identical parts that a chromosome splits into during cell division, each part consisting of one of the two identical DNA strands that made up the original chromosome.

“The chromatids were observed under a microscope as they separated and moved to opposite poles of the cell.”