Albert SN, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons
flabellate --Merriam-Webster
adjective
variants or less commonly flabelliform
fləˈbeləˌfȯrm
: resembling a fan in shape
Etymology
flabellate probably from (assumed) New Latin flabellatus, from Latin flabellum fan + -atus -ate; flabelliform probably from (assumed) New Latin flabelliformis, from Latin flabelli- + -formis -form