Sierdrean 

When two close friends really love each other

Andrea and Sierra are Sierdrean.

Sierdrean by Tyclarea November 10, 2006

Sierreño 

A genre of mexican music most of the time made up of 3 instruments, and 3 players, Acoustic Guitar, Bass Guitar, and Accordion (Piano keys or buttons, but most of the time buttons). Other Sierreño groups can also have 2 Acoustic Guitars,(a Bajo Sexto, and a Bajo Quinto), and either a Tuba or Bass Guitar.

Jose- Hey man what are you listening to man?
Juan- I'm listening to this new sierreño group, Los Alameños de La Sierra.

Sierreño by Mijo_Antrax November 9, 2012

sierran 

Excessively beautiful, as relating to the Sierra Nevada mountains. Awe-inspiring.

That view of the waterfall is sierran.

sierran by Lech Naumovich June 16, 2008

Sierrian 

An individual born and breed in or from the Sierra Mountains.

I’m from this place I like to call Gods green belt. This little place thats right above the fog and just below the snow. This little place called the foothills of the Sierra Mountains. They’ve been out my back door my whole life. To grow up in every day I get to spend in them. So I guess I’m.a Sierrian. A Sierrian way of life. A Sierrian outlook.

Sierrian by stubb209er June 13, 2018