wiertniczych
Wiertniczych is a Polish adjective form meaning drilling-related. It is not a standalone noun; it functions to describe a noun and agrees with it in case, number, and gender. The form wiertniczych is the genitive plural (and sometimes accusative plural) of the base adjective wiertniczy, which derives from the verb wiercić (to drill) and the noun wiertnica (drilling rig). In technical writing, this form appears when the modified noun is in genitive plural.
In practice, wiertniczych appears in contexts connected with drilling activities in fields such as geology, geotechnics,
Related forms include wiertniczy (drilling-related, masculine singular), wiertnicze (drilling-related, neuter plural or feminine plural agreement in
See also: wiercić, wiertnica, geologia, geotechnika, przemysł wydobywczy.