an ox or bull: the cattle animal of the herd, the largest and costliest beast a person could keep or offer
This is the Aramaic word for cattle, and it is the very same word as the Hebrew name for an ox (שׁוֹר). The two languages simply say one old sound differently: where Hebrew has an "sh", Aramaic regularly has a "t". The same swap turns the Hebrew number three, "shalosh", into Aramaic "telat". So a reader who already knows the Hebrew ox knows this word too; it is that word in Aramaic dress.
Written out, it looks exactly like several unrelated Hebrew words: the verb for scouting out a land (תּוּר), the noun for a turn that comes round to someone in a sequence (תּוֹר), and the name of the turtledove (תֹּר). None of them has anything to do with cattle. The match is an accident of spelling, and the thing that settles it is the language of the passage: this word turns up only in the Aramaic stretches of Ezra and Daniel.
All three appearances in Ezra are about sacrifice, and in each one the bulls head the list, ahead of the rams and the lambs. The Persian crown agrees to supply them (Ezra 6:9), a hundred of them are offered when the rebuilt house of God is dedicated (Ezra 6:17), and Ezra is told to buy more with the king's silver (Ezra 7:17). Ezra 6:9 asks for "sons of bulls", which is simply how Aramaic says young ones.
The other four appearances are one sentence about Nebuchadnezzar, repeated as the sentence is announced, confirmed, carried out, and later recalled: driven away from people, he ate grass like cattle (Daniel 4:25, Daniel 4:32, Daniel 4:33, Daniel 5:21). Put beside Ezra, the effect is sharp. The animal at the head of the offering list, the costliest gift a king could bring to God, is also the animal that stands in a field with its head down, and the proud king ends up living the second life instead of presenting the first.