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primitive stone artifact (usually made of sandstone) used as an abrader abrading stone
primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves alga , algae
group of primitive, chlorophyll-containing plants in fresh and salt water algae
primitive long-bodied carnivorous freshwater fish with a very long dorsal fin; found in sluggish waters of North America Amia calva , bowfin , dogfish , grindle
small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates amphioxus , lancelet
primitive reptile having no opening in the temporal region of the skull; all extinct except turtles anapsid , anapsid reptile
highly variable species of very large primitive ferns of the Pacific tropical areas with high rainfall angiopteris , Angiopteris evecta , giant fern
United States painter of colorful and primitive rural scenes (1860-1961) Anna Mary Robertson Moses , Grandma Moses , Moses
bulky nocturnal burrowing rodent of uplands of the Pacific coast of North America; the most primitive living rodent Aplodontia rufa , mountain beaver , sewellel
extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds archaeopteryx , Archaeopteryx lithographica , archeopteryx
extinct primitive toothed bird with a long feathered tail and three free clawed digits on each wing archaeornis
primitive reptile-like fossil birds of the Jurassic or early Cretaceous Archaeornithes , subclass Archaeornithes
primitive cell or group of cells from which a mother cell develops archespore , archesporium
small primitive marine worm lacking external segmentation and resembling polychaete larvae archiannelid
primitive state, reversion to atavism
reversion to more primitive form atavism , throwback
organism that has the characteristics of a more primitive type of that organism atavist , throwback
act that makes people primitive and uncivilized barbarisation , barbarization
living fossil or so-called `green dinosaur'; genus or subfamily of primitive nut-bearing trees thought to have died out 50 million years ago; a single specimen found in 1994 on Mount Bartle Frere in eastern Australia; not yet officially named Bartle Frere , genus Bartle-Frere , green dinosaur
primitive predaceous North American fish covered with hard scales and having long jaws with needlelike teeth billfish , gar , garfish , garpike , Lepisosteus osseus
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