mountain desert (n.) 5 realizations Multi-area
NEW Realization 1
type Polysemy
language Ancient Greek
lexeme ὄρος
meaning 1 mountain
direction
meaning 2 (Egyptian) desert (n.)
reference LSJ
comment

The sense "desert" is a semantic loan from Demotic Egyptian tw (“mountain, desert”), from Egyptian ḏw (“mountain”). 

NEW Realization 2
type Polysemy
language Coptic
lexeme toou
meaning 1 (Sahidic) mountain
direction
meaning 2 (Sahidic) mountain
reference <personally collected data>
comment

Crum, Walter E. (1939), A Coptic Dictionary‎, Oxford: Clarendon Press, page 441
Černý, Jaroslav (1976), Coptic Etymological Dictionary, Cambridge: Cambridge University Press, page 199

NEW Realization 3
type Polysemy
language Coptic
lexeme tau
meaning 1 (Akhmimic, Fayyumic) mountain
direction
meaning 2 (Akhmimic, Fayyumic) desert
reference <personally collected data>
comment

Crum, Walter E. (1939), A Coptic Dictionary‎, Oxford: Clarendon Press, page 441
Černý, Jaroslav (1976), Coptic Etymological Dictionary, Cambridge: Cambridge University Press, page 199

NEW Realization 4
type Polysemy
language Coptic
lexeme tōou
meaning 1 (Bohairic) mountain
direction
meaning 2 (Bohairic) desert
reference <personally collected data>
comment

Černý, Jaroslav (1976), Coptic Etymological Dictionary, Cambridge: Cambridge University Press, page 199

NEW Realization 5
type Polysemy
language Demotic Egyptian
lexeme tw
meaning 1 mountain
direction
meaning 2 desert (n.)
reference <personally collected data>
comment

From Archaic Egyptian ḏw 'mountain'

Faulkner, Raymond Oliver (1962), A Concise Dictionary of Middle Egyptian, Oxford: Griffith Institute
James P[eter] Allen (2010), Middle Egyptian: An Introduction to the Language and Culture of Hieroglyphs, 2nd edition, Cambridge: Cambridge University Press, page 213.