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Rhynchocephala
- An order of reptiles having biconcave vertebrae, immovable quadrate bones, and many other peculiar osteological characters. Hatteria is the only living genus, but numerous fossil genera are known, some of which are among the earliest of reptiles. See Hatteria. Called also Rhynchocephalia.
Rhyncholite
- A fossil cephalopod beak.
Rhynchonella
- A genus of brachiopods of which some species are still living, while many are found fossil.
Rhynchophora
- A group of Coleoptera having a snoutlike head; the snout beetles, curculios, or weevils.
Rhyparography
- In ancient art, the painting of genre or still-life pictures.
Rhysimeter
- An instrument, acting on the principle of Pitot's tube, for measuring the velocity of a fluid current, the speed of a ship, etc.
Rhythmer
- One who writes in rhythm, esp. in poetic rhythm or meter.