IPA: /trænˈsmɪsəˌmɛtər/
KK: /trænˈsmɪsəˌmɪtər/
A device that measures how much light passes through a material or fluid.
The scientist used a transmissometer to analyze the clarity of the water sample.
Transmissometer → It is formed from "trans-" (meaning across) and "missus" (from "mittere", meaning to send) and "-meter" (meaning measure). The word refers to an instrument that measures the transmission of light or other signals across a distance.
Think of something that 'sends' ('missus') signals 'across' ('trans-') and measures them ('-meter'). This helps you remember that a transmissometer is a device that measures how much signal passes through.
No commonly confused words.