Silence: single target

[Matthew]

Courtesy of Baldur's Gate 2, and James Bolton's Mage Spell FAQ:

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Power Word, Silence (conjuration/summoning)
Level: 6
Range: 30 yards
Duration: 7 rounds
Casting Time: 1
Area of Effect: 1 creature
Saving Throw: None

In using this spell the wizard points at an individual and utters the
power word. For the next seven rounds, that creature cannot make any
sound. This silence completely foils any spells that require verbal
components. The only counter to this spell is a dispel magic and
vocalize. There is no saving throw.

Interesting. Might be in one of the spell compendiums, it's definitely not from the main lists (Player's Handbook, Tome of Magic, Spells and Magic).