den·si·tom·e·ter \ˌden(t)səˈtäməd.ə(r)\noun (-s) Etymology:density + -o- + -meter 1.: densimeter 2.: an instrument for measuring optical density; specifically: an instrument usually photoelectric or visual for measuring photographic density by means of the light transmitted or the light reflected • den·si·to·met·ric\| ̷ ̷səd.ə|me.trik\adjective • den·si·tom·e·try\ˌ ̷ ̷səˈtämə.trē\noun-es