Definition of micrometrical in US English:

micrometrical

adjective

rare
  • = micrometric.

Origin

Early 18th century; earliest use found in Philosophical Transactions of the Royal Society of London. From micro- + -metrical, after micrometer.

Pronunciation

micrometrical

/ˌmʌɪkrə(ʊ)ˈmɛtrɪkl/