Definition of microtunnelling in English:

microtunnelling

noun

  • The formation or construction of extremely small-diameter tunnels, especially (in Engineering) the mechanical excavation of such tunnels, which are typically used for pipe-laying.

adjective

  • Of, relating to, or designating the formation or construction of very small-diameter tunnels or channels, especially (in Engineering) the mechanical excavation of such tunnels, e.g. for pipe-laying. Usually attributive.

Origin

1980s; earliest use found in Soviet Materials Science. From micro- + tunnelling<br>1980s; earliest use found in Japan Telecommunications Review. From microtunnelling; compare -ing.

Pronunciation

microtunnelling

/ˌmʌɪkrə(ʊ)ˈtʌn(ə)lɪŋ/