The term 'Tens of Thousands' is a way of expressing a large number, usually between 10, 000 and 99, 999. It is often used to describe a large quantity of something, such as people or objects. The crossword solution for this term is 'Myriads', which is another way of saying a large number, usually between 10, 000 and 100, 000. Myriads is derived from the Greek word 'MYRIAD', which means ten thousand.