Octopetalous

Part of speech: adjective

Definitions

1. Characterized by having a floral structure that features exactly eight petals
2. Denoting a specific quality of certain flowers that have a total of eight distinct petals
3. Describes a flower with a structure that includes precisely eight petals

Etymology: Octopetalous is a plain technical formation: the Greek-derived combining form "octo-", meaning eight, joined to "petalous", which is itself built from "petal" and the adjectival ending "-ous". Botanists needed a compact way to describe flowers by their petal count, and this is one of the many number-based terms that follow the same pattern, such as "tetrapetalous" for four petals or "pentapetalous" for five. The "petal" element comes from the Greek "petalon", meaning leaf, and in English it passed into botanical description as a term for the showy parts of a flower. The adjectival ending "-ous" turns the noun into a description of having that feature, so "petalous" means having petals, and the prefix narrows the count to exactly eight.