半数致死浓度EC50的英文全称是什么？

Question

请问半数致死浓度EC50的英文全称是什么？

Answer 1

半效应浓度（median effect concentration）

The molar concentration of an agonist, which produces 50% of the maximum possible response for that agonist.

PS：并不仅仅指“致死”，尽管表述在“致死效应“用得最多。

Answer 2

Median Effective Concentration (required to induce a 50% effect)

参考资料：http://acronyms.thefreedictionary.com/EC50