noun Canadian.
an aboveground, insulated network of pipes and cables, used to convey water and electricity in communities situated in areas of permafrost.

utili(ty) + -dor, as in thermidor

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World English Dictionary
utilidor (juːˈtɪlɪˌdɔː)
(Canadian) an enclosed and insulated conduit for sewage and other utilities placed above the level of permafrost

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Example sentences
The height appears taller than on stage because the facility actually drops down to the utilidor level.
In addition, the existing condensate return line will be replaced from the mechanical room to the utilidor connection.
The potential for migration of vapors into the utilidor was high.
The logical direction of the drain pipe was heading straight for what appears to be an underground utilidor.
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