X chro ‧ mo ‧ some /ˈeks ˌkrəʊməsəʊm $ -ˌkroʊməsoʊm/ BrE AmE noun
[countable] a type of ↑ chromosome that exists in pairs in female cells, and together with a ↑ Y chromosome in male cells
X chro ‧ mo ‧ some /ˈeks ˌkrəʊməsəʊm $ -ˌkroʊməsoʊm/ BrE AmE noun
[countable] a type of ↑ chromosome that exists in pairs in female cells, and together with a ↑ Y chromosome in male cells
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012