[tuh-rid-uh-fahyt, ter-i-doh-] /təˈrɪd əˌfaɪt, ˈtɛr ɪ doʊ-/
any plant of the division Pteridophyta, characterized by vascular tissue and differentiation into root, stem, and leaves, comprising the ferns, horsetails, and club mosses.
(in traditional classification) any plant of the division Pteridophyta, reproducing by spores and having vascular tissue, roots, stems, and leaves: includes the ferns, horsetails, and club mosses. In modern classifications these plants are placed in separate phyla
Any of various vascular plants that reproduce by spores rather than seeds; a seedless vascular plant. The pteridophytes include the lycophytes, the horsetails, and the ferns, as well as a small group of related plants called the psilophytes and several extinct phyla.
[tuh-rid-uh-spurm, ter-i-doh-] /təˈrɪd əˌspɜrm, ˈtɛr ɪ doʊ-/ noun 1. seed fern. pteridosperm /ˈtɛrɪdəˌspɜːm/ noun 1. any extinct seed-producing fernlike plant of the group Pteridospermae Also called seed fern
noun, Craniometry. 1. the craniometric point at the side of the sphenoidal fontanelle. pterion pter·i·on (těr’ē-ŏn’, tēr’-) n. The junction of the greater wing of the sphenoid bone and the squamous temporal, the frontal, and the parietal bones.
1. a combining form meaning “wing,” “feather,” used in the formation of compound words: pterodactyl. combining form 1. wing, feather, or a part resembling a wing: pterodactyl ptero- or pter- pref. Wing; feather: pterion.
[ter-uh-kahr-puh s] /ˌtɛr əˈkɑr pəs/ adjective, Botany. 1. having winged fruit.
noun 1. any of a number of genera of flying reptiles of the extinct order Pterosauria, from the Jurassic and Cretaceous periods, having a highly reduced tail and teeth and a birdlike beak. noun 1. any extinct flying reptile of the genus Pterodactylus and related genera, having membranous wings supported on an elongated fourth digit […]