English
thunderbox
From thunder + box.
The story
Senses 1 and 2 (‘portable commode; any lavatory or toilet’) are probably because of the noises that may be made while defecating.
Today it means
noun A chamber pot enclosed in a box; a portable commode.
Sources
Sources: Wiktionary, “thunderbox”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / thunderbox