英文食谱中的计量单位缩写c是什么意思?

英文食谱中的计量单位缩写c是什么意思?
我只想知道下面这个计量单位——C.的意思
MUSHROOM BISQUE--Syn old menubook
3 3/4 c. butter(or margerine)
10 c. chopped onions
20 c. choppped celery (may have to improvise with celery seed)
7 Tbl dried dill weed
20 c. finely chopped spinach
40 c. sliced mushrooms
50 c. milk/soy milk
2 1/2 c. unbleached white flour
10 c. water
5 tsp salt