"Of a plant: (originally) †belonging or allied to the ferns ( obsolete ); (now) specifically belonging to the subfamily Pteridoideae (family Pteridaceae)", Mid 19th cent.; earliest use found in The Pall Mall Gazette. From classical Latin pterid-, pterispteris + -oid, after scientific Latin Pteris, genus name. In later use after scientific Latin Pteridoideae, family name.[pteridoid etymology, pteridoid origin, 英语词源]