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crayfish

(Encyclopedia)crayfish or crawfish, freshwater crustacean smaller than but structurally very similar to its marine relative the lobster, and found in ponds and streams in most parts of the world except Africa. Cray...

chlamydia

(Encyclopedia)chlamydia kləmĭdˈēə [key], genus of microorganisms that cause a variety of diseases in humans and other animals. Psittacosis, or parrot fever, caused by the species Chlamydia psittaci, is transmi...

elm

(Encyclopedia)elm, common name for the Ulmaceae, a family of trees and shrubs chiefly of the Northern Hemisphere. Elm trees (genus Ulmus) have a limited use as hardwoods for timber, especially the rock or cork elm ...

ichneumon fly

(Encyclopedia)ichneumon fly ĭkno͞oˈmən [key], common name for a family of insects, related to the wasps, whose larvae are parasitic on many other insects. Over 3,000 species of ichneumon flies, also known as ic...

holly

(Encyclopedia)holly, common name for members of the Aquifoliaceae, a family of widely distributed trees and shrubs, most numerous in Central and South America. The evergreen English holly (Ilex aquifolium), the com...

Jimson weed

(Encyclopedia)Jimson weed or Jamestown weed, large, coarse annual plant (Datura stramonium) of the family Solanaceae (nightshade family), native to warm-temperate and tropical regions of the New World, but long wid...

mountain ash, in botany

(Encyclopedia)mountain ash, name for any species of the genus Sorbus of the family Rosaceae (rose family), hardy ornamental trees and shrubs native to the Northern Hemisphere, not related to the true ashes. They ar...

locust, in botany

(Encyclopedia)locust, in botany, any species of the genus Robinia, deciduous trees or shrubs of the family Leguminosae (pulse family) native to the United States and Mexico. The locusts have pendent clusters of flo...

peony

(Encyclopedia)peony pēˈənē [key], any plant of the genus Paeonia of the family Ranunculaceae (buttercup family, although placed in the order Dilleniales as a separate family, the Paeoniaceae, by many modern bot...

azalea

(Encyclopedia)azalea əzālˈyə [key] [Gr.,=dry], any species of the genus Rhododendron, North American and Asian shrubs of the family Ericaceae (heath family) that are distinguished by the usually deciduous leave...