tantarum
tantarum is a Latin form of tantus, meaning “so great, so much”. It is the genitive plural feminine adjective.
Found 30 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 8.0.5: qui sunt editi, ne scientia tantarum rerum scriptoribus deesset, adeoque probantur omnium iudicio ut praerepta, non praebita, facultas scriptoribus videatur.
Silius Italicus, Punica 1.17: Tantarum causas irarum odiumque perenni
All forms of tantus (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.