Definitions

1. noun

A unit of radioactivity equal to 3.7 x 10^7 disintegrations per second.

“The nuclear physicist measured the radioactivity in millicuries.”

2. noun

A unit of radioactivity in the International System of Units (SI) equal to 3.7 x 10^7 decays per second.

“The lab used millicuries to measure the amount of radiation in the sample.”