Gûl
gûl is a word used in both Sindarin and the Black Speech (derived from the former).
Sindarin
In Sindarin, gûl originally referred to "secret knowledge, arts" or "the deeper knowledge of the 'wise' or skilled persons". However, the word came to be associated with Morgoth's black arts (as in the compound morgul). It is therefore also found glossed as "evil or perverted knowledge, necromancy, sorcery".
Black Speech
In the Black Speech, gûl (or gūl) is glossed as "(phantom, shadow of dark magic, necromancer), slave, servant?", "[evil] spirit". In The Lord of the Rings, gûl is translated as "wraiths" (as in Nazgûl, the Ringwraiths).
Other versions of the legendarium
In the Etymologies appears the Noldorin form gûl ("magic").
Referencias
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