1980s; earliest use found in Soviet Journal Optical Technology. From photo- + tachymetric, after phototachymeter. Compare Russian svetodal′nomernyj from svetodal′nomer + -nyj, suffix forming adjectives.
Definition of phototachymetric in US English:
phototachymetric
adjectiveˌfəʊtəʊtakɪˈmɛtrɪk
Of or relating to a phototachymeter or its use.
Origin
1980s; earliest use found in Soviet Journal Optical Technology. From photo- + tachymetric, after phototachymeter. Compare Russian svetodal′nomernyj from svetodal′nomer + -nyj, suffix forming adjectives.