centromere

https://doi.org/10.1351/goldbook.10502

Constricted region of a chromosome that joins the two chromatids to each other and attaches to spindle fibers in mitosis and meiosis.

Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 734 [Terms] [Paper]