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barometer
(Encyclopedia) CE5 Aneroid barometer barometerbarometerbərŏmˈətər [key], instrument for measuring atmospheric pressure. It was invented in 1643 by the Italian scientist Evangelista Torricelli…seasons
(Encyclopedia) CE5 The seasons are caused by the tilt of the earth's axis to the plane of its orbit about the sun. The Northern Hemisphere is tilted toward the sun in the summer and receives more…testosterone
(Encyclopedia) CE5 testosteronetestosteronetĕstŏsˈtərōn [key], principal androgen, or male sex hormone. One of the group of compounds known as anabolic steroids, testosterone is secreted by the…alkane
(Encyclopedia) CE5 Alkanes alkanealkaneălˈkān [key], any of a group of aliphatic hydrocarbons whose molecules contain only single bonds (see chemical bond). Alkanes have the general chemical…gastropod
(Encyclopedia) CE5 Internal anatomy of a snail, Helix aspersa, representative mollusk of the class Gastropoda gastropod, member of the class Gastropoda, the largest and most successful class of…feathers
(Encyclopedia) CE5 Structure of a bird feather feathers, outgrowths of the skin, constituting the plumage of birds. Feathers grow only along certain definite tracts (pterylae), which vary in…heating
(Encyclopedia) CE5 Typical warm-air heating system heating, means of making a building comfortably warm relative to a colder outside temperature. Old, primitive methods of heating a building or a…buttress
(Encyclopedia) CE5 Types of buttresses buttress, mass of masonry built against a wall to strengthen it. It is especially necessary when a vault or an arch places a heavy load or thrust on one part…adrenal gland
(Encyclopedia) CE5 Adrenal glands: The cross-sectioned area shows the adrenal cortex and medulla. adrenal glandadrenal glandədrēnˈəl [key] or suprarenal glandsuprarenal glands&oomacr;…beech
(Encyclopedia) CE5 American beech Fagus grandifolia beech, common name for the Fagaceae, a family of trees and shrubs mainly of temperate and subtropical regions in the Northern Hemisphere. The…Trending
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