Entry 1 sense Webster, 1913 bevatron · bev·a·tron · IPA /ˈbɛv.əˌtɹɑn/ 01 n. a particle accelerator which is capable of accelerating protons up to 6 gigaeletron volts. 1. a particle accelerator which is capable of accelerating protons up to 6 gigaeletron volts.