olemus
nõgus pinnavorm otseses või ülekantud tähenduses

Wiktionary:
1. an elongated depression between hills or mountains, often with a river flowing through it
3. any structure resembling one, e.g. the interior angle formed by the intersection of two sloping roof planes

näide
ISO/IEC 19794, biomeetria:
kahe papillaarkurru vaheline ala,
mis normaalsel puudutusel ei ulatu puudutatava pinnani
=
area between two friction ridges that does not make contact with an incident surface under normal touch

https://duckduckgo.com/?q=fingerprint+valley&t=h_&iax=images&ia=images

vt ka
- oruhargmik