pantechnicon
A building or place housing shops or stalls where all sorts of (especially exotic) manufactured articles are collected for sale.
To-day will the mighty cobweb-dome receive its last survey, previous to the contractors for the building handing it over to the painters and decorators. When these have accomplished their task, then will the walls and counters begin to receive their varied and valuable stores of natural and artificial productions. Waggon-loads upon waggon-loads must, we know, be exhausted, and pantechnica emptied, before the vast area, so delicately covered, shall cry “Enough, enough;” […]
Originally pantechnicon van: a van, especially a large moving or removal van.
For we do not employ battleships as convoys, nor even as pantechnica conveying landing parties.
Where it comes from
From Pantechnicon, a 19th-century firm which owned a building with a Greek-style facade of Doric columns in Motcomb Street, Belgrave Square, London, UK, with a picture gallery, a furniture shop, a shop selling carriages, and a warehouse for storing customers’ furniture and other items. The firm used large horse-drawn vans to collect and deliver their customers' property, which came to be known as Pantechnicon vans. The word was coined by the firm from pan- (“all”) (from Ancient Greek πᾶν (pân), neuter form of πᾶς (pâs, “all, every”)) + τεχνικόν (tekhnikón), neuter singular of τεχνικός (tekhnikós, “technical”).
Adapted from the Wiktionary entry pantechnicon (CC BY-SA 4.0).