Endometriosis is a condition that causes endometrial tissue to grow outside of the uterus. This tissue can be found in patches on the surface of the ovaries, bladder, colon and abdomen.
It refers to the fact that the bottles were 1/5th of a gallon. These days most bottles are 750 ml, which is close to 1/5 of a gallon. A gallon contains 128 fluid ounces. So a fifth (1/5) or 750ml contains a tad more than 25 oz, or 25 one-ounce shots. Of course, many use 1 Â½ ounce for a standard shot which is around 16 shots. Bar Measurement Chart.
We no longer measure bottle sizes by fractions of a pint or gallon, and the term fifth may be archaic. However, 1/5 gallon, or 4/5 quart is 25.6 ounces, which is so very close to 750ml (25.4oz) that we still use the term fifth to describe this size bottle. The fifth stopped being the standard size of a U.S. liquor bottle on January 1, 1980.