UNDERLAYER
Meaning of UNDERLAYER in English
ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷ noun
Etymology: under (III) + layer
: a layer that underlies another : substratum
Webster's New International English Dictionary.
Новый международный словарь английского языка Webster.
2012