Why is the ninth month called September?
1680s, from Latin calyx, from Greek kalyx "seed pod, husk, outer covering" (of a fruit, flower bud, etc.), from root of kalyptein "to cover, conceal" (see cell). The proper plural is calyces. Some sources connect the word rather with Greek kylix "drinking cup."
calyx ca·lyx (kā'lĭks, kāl'ĭks)
Variant of calix.
The sepals of a flower considered as a group. The calyx is the outermost whorl of a flower. See more at sepal.