-acea

-acea

suffix forming plural proper nouns
denoting animals belonging to a class or order: Crustacea (class); Cetacea (order).
[New Latin, from Latin, neuter plural of -āceus -aceous]

-acea

a suffix used in the formation of names of zoological classes and orders: Crustacea.
[< Latin, neuter pl. of -āceus. See -aceous]