層

sedimentary layer

Derogatory; Slang

low-IQ people who are easily influenced by mass media; sheeple

D layer (of the ionosphere)

earthquake fault

fossil bed

Mathematics

presheaf; anterior layer

ozone layer depletion

altostratus clouds

there is a huge markup in medicines, making it a profitable field; medicines sell for ten times the cost of their ingredients

ore bed

medium and high-rise (buildings, apartments, etc.)

Computing

class hierarchy

20-to-34 female demographic (target audience)

Physics

boundary layer

Geology

diluvium; diluvial formation

Computing

hierarchical relation

coal bed

submucosa

stratovolcano; composite volcano

subsoil

winds aloft

fault zone; fault belt

fault-block mountains

type of audience