from The American Heritage® Dictionary of the English Language, 4th Edition
- suffix Variant of -aceous.
- suffix An organism belonging to a taxonomic group: cetacean.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- suffix various organisms belonging to a taxonomic group
From New Latin -ācea, neuter pl. of -āceus, -aceous.(American Heritage® Dictionary of the English Language, Fourth Edition)