lalaith is a noun meaning "laughter" in Sindarin.
It is possible that this word shows influence from lala- in Quenya.
In Sindarin, the verb is gladha-, from root G-LAD.
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Silmarillion, "Index of Names"
- ↑ Didier Willis, Hiswelókë's Sindarin Dictionary at Jrrvf.com (accessed 19 July 2011)