Masechta Tamid is referred to in the singular Tamid rather than Temidim, although there are two karbonos (sacrifices)—the Tamid shel Shachar and the Tamid shel Bein Ha’arbayim. Why is it in the singular?
This can be answered with a Radak. He explains that in the future, there will be only one Tamid offering—in the morning (Tamid shel Shachar), without a corresponding Tamid shel Bein Ha’arbayim in the afternoon. The Chida cites the Maaseh Rokeach that this is why it is called Tamid in the singular—to hint at the ultimate future when only one Tamid will remain.