duquel

Contraction of de (“of/from”) +‎ lequel (“which”).

• IPA^(key): /dy.kɛl/

• audio

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duquel m (feminine de laquelle, masculine plural desquels, feminine plural desquelles) (relative)

1. of which, of whom, from which, from whom

   Voilà l’homme à côté duquel Marc s’asseyait.

   There is the man next to whom Marc was sitting.

• Duquel is used with compound prepositions ending in de, such as à côté de, près de, en faveur de (as above).
• Duquel can also replace the possessive dont (“whose”). This is overall rare, but it is necessary when the noun phrase is preceded by any preposition: l'homme avec la femme duquel j'ai parlé (“the man with whose wife I've spoken”).

• auquel
• dont
• lequel

• “duquel”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.
• French pronouns on Wikipedia.Wikipedia
• Wiktionnaire