Perianthium

Part of speech: noun

Definitions

1. The outer protective and ornamental layers of a flower, consisting of the sepals and petals surrounding the reproductive organs
2. The combined envelope of sepals and petals that encloses and protects the inner reproductive structures of a flower
3. The external floral whorls made up of modified leaves that surround and shelter the flower's stamens and pistils

Etymology: "Perianthium" is a botanical coinage built from Greek parts: "peri-", meaning "around," and "anthos," meaning "flower." Put together, it names the set of floral parts that surround the reproductive organs, the petals and sepals that form the outer ring of a flower. Botanists working in New Latin, the scholarly Latin used across Europe for naming plants and animals, assembled the term from these classical pieces, with the Latin suffix "-ium" completing it in the same pattern as many technical names. The word is therefore a deliberate scientific construction rather than an ancient term, and no Greek or Roman writer used it. The Greek parts themselves are ordinary: "anthos" is the same root that gives English "anthology," a collection of flowers in the sense of a gathered bouquet of writings, and "perianth" is a close relative formed in the same way.

Synonyms: perianth