The American English word chowder refers to a thick fish soup made in New England. It is said (here) to go back to late Latin caldaria ‘cooking pot’. More specifically: Fr. chaudrée, a thick fish soup of the Charentes region (recipe here).
Cite this post as: Laurent Sagart, "Lockdown etymologies: chowder," in Sino-Tibetan-Austronesian, 04/05/2020, https://stan.hypotheses.org/863.