Definition of pteridoid in US English:

pteridoid

adjective

Botany
rare
  • Of a plant: (originally) †belonging or allied to the ferns (obsolete); (now) specifically belonging to the subfamily Pteridoideae (family Pteridaceae).

noun

Botany
rare
  • A fern, especially one belonging to the subfamily Pteridoideae.

Origin

Mid 19th century; earliest use found in The Pall Mall Gazette. From classical Latin pterid-, pteris pteris + -oid, after scientific Latin Pteris, genus name. In later use after scientific Latin Pteridoideae, family name.

Pronunciation

pteridoid

/ˈtɛrɪdɔɪd/