What does Acrocentric chromosome mean?

Acrocentric chromosome meaning in Medical Dictionary

A chromosome in which the centromere is situated quite near one end of the chromosome. Humans as a rule have five pairs of acrocentric chromosomes. Down syndrome is due to a supplementary acrocentric chromosome (chromosome21).

Acrocentric chromosome meaning in General Dictionary

a chromosome with the centromere near one end so one chromosomal supply is short and another is long