Entry 2 senses · 2 variants Webster, 1913 dosimeter · IPA n. n. 01 n. for measuring doses of . 1. for measuring doses of . Syn. dosemeter. 02 n. a device for measuring doses of radiation, especially ionizing radiation such as X-rays, gamma rays, or ionizing particles. 1. a device for measuring doses of radiation, especially ionizing radiation such as X-rays, gamma rays, or ionizing particles.