ˈärkə noun
Etymology: New Latin, from Latin, chest, box — more at ark
1. plural ar·cae -ˌkī, -ˌsē
[Latin]
: a chest or strong box used in ancient times as a receptacle for money or valuables and also by primitive Christians for reserving the consecrated bread of the Eucharist
2. capitalized : a genus (the type of the family Arcidae) of bivalve mollusks comprising the ark shells and blood clams