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Rhaetic
- Pertining to, or of the same horizon as, certain Mesozoic strata of the Rhetian Alps. These strata are regarded as closing the Triassic period. See the Chart of Geology.
Rhaetizite
- A variety of the mineral cyanite.
Rhamnaceous
- Of or pertaining to a natural order of shrubs and trees (Rhamnaceae, or Rhamneae) of which the buckthorn (Rhamnus) is the type. It includes also the New Jersey tea, the supple-jack, and one of the plants called lotus (Zizyphus).
Rhamphorhynchus
- A genus of pterodactyls in which the elongated tail supported a leathery expansion at the tip.
Rhamphotheca
- The horny covering of the bill of birds.
Rhaphides
- Minute transparent, often needle-shaped, crystals found in the tissues of plants.