(adjective, declension-1, declension-2) of such size, of such measure
(adjective, declension-1, declension-2) so much, so great, such, so many
Pronounced as (IPA)
[ˈtan.tʊs]
Etymology
From tam (“so”) + -tus (adjectival/adverbial ending); compare quantus, intus, subtus.
One alternate etymology supposes direct continuation from Proto-Indo-European *teh₂-n̥t-os.