by ellipsis from Terai hat, after Terai, Tarai (Hindi Tarāī, Nepali Taraī), grassland and marsh belt between the Himalayan foothills and the plains of the Indus and Ganges
1888, in the meaning defined above
“Terai.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/terai. Accessed 5 Dec. 2023.
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