1 definition by C. Darwin
An abbreviation for the endoplasmic reticulum. May be heard among success-driven high school students studying for the AP Biology exam.
It's also an acronym for emergency room.
It's also an acronym for emergency room.
The ER can be a televized show or an essential part of life; either way both are used as the acronym.
by C. Darwin July 27, 2006