teˈstāsh(ē)ə noun plural
Usage: capitalized
Etymology: New Latin, from Latin, neuter plural of testaceus covered with a shell
: an order of Rhizopoda containing forms (as of the genera Arcella and Difflugia ) with an external test
• tes·ta·cean (ˈ) ̷ ̷| ̷ ̷shən adjective or noun