an instrument used to measure light transmission through a material
transmissometer in American English
(ˌtrænsməˈsɑmɪtər, ˌtrænz-)
noun
Meteorology
an instrument for measuring visibility or the transmission of light in the atmosphere
Also called: hazemeter, transmittance meter
Word origin
[1930–35; transmiss(ion) + -o- + -meter]This word is first recorded in the period 1930–35. Other words that entered Englishat around the same time include: boondoggle, kickback, logical positivism, preset, saddle stitch-o- is the typical ending of the first element of compounds of Greek origin (as -i- is, in compounds of Latin origin), used regularly in forming new compounds with elementsof Greek origin and often used in English as a connective irrespective of etymology(Franco-Italian; geography; seriocomic; speedometer); -meter is a combining form meaning “measure,” used in the names of instruments measuringquantity, extent, degree, etc. Other words that use the affix -meter include: altimeter, interferometer, radiometer, telemeter, thermometer