I want to know the answer to the following question:
What is the Greek word for "case" or "casing"?
All the background I'm provided with is that "The term "angiosperm" comes from the Greek composite word (angeion-, "case" or "casing", and sperma, "seed") meaning "enclosed seeds", after the enclosed condition of the seeds.". Is that enough to answer the question?
Answer: yes