What is the meaning of Plurale_tantum?

A noun (either in certain of its senses or in all its senses) that does not generally have a singular form.

a noun (either in certain of its senses or in all its senses) that does not generally have a singular form

plurale tantum

A noun (either in certain of its senses or in all its senses) that does not generally have a singular form.

Source: wiktionary.org