a.[Z][B]

1. （地点，位置等）较高的；上面的；上首的
   He has a scar on his upper lip.

   他的上唇有一道疤痕。

2. 上游的；内地的；北部的
   the upper reaches of the Mississippi River

   密西西比河上游

3. （地位，等级）较高的；上层的；上流的
   This part of town is where the upper class live.

   镇上这个地区是上层阶级的人住的。

4. 上院的，参议院的

n.[C]

1. 鞋帮
2. 【口】上铺
3. 上齿
4. 上排假牙[P]
5. 【俚】兴奋剂（安非他命）

adj.

1. situated above another part.
   ▸higher in position or status.
   ▸ (often Upper) Geology  & Archaeology  denoting a younger (and hence typically shallower) part of a stratigraphic or archaeological division:

   the Upper Palaeolithic.
2. situated on higher ground.
3. [in place names] situated to the north.

n.

n.