| birth rate |
birthrate: the ratio of live births in an area to the population of that area; expressed per 1000 population per year
출처: wordnet.princeton.edu/perl/webwn
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| birthmark |
a blemish on the skin that is formed before birth
출처: wordnet.princeton.edu/perl/webwn
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| birch |
Birch is the name of any tree of the genus Betula, in the family Betulaceae, closely related to the beech/oak family, Fagaceae. These are generally small to medium-size trees or shrubs, mostly of northern temperate climates. The simple leaves may be toothed or lobed. The fruit is a small samara, although the wings may be obscure in some species. ...
출처: en.wikipedia.org/wiki/Birch
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| biramous |
Biramous is a term used for branched arthropod appendages. Theseare most commonly branched into a gill and leg with a common root at a body segment. Each leg/gill structure will be paired with a second biramous structure on the other side of the body. Biramous appendages are best known from trilobites where all the legs -- both on the head and the thorax -- are parts of biramous structures with a gill branching off above the leg. ...
출처: en.wikipedia.org/wiki/Biramous
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| birefringence |
Birefringence, or double refraction, is the division of a ray of light into two rays (the ordinary ray and the extraordinary ray) when it passes through certain types of material, such as calcite crystals, depending on the polarization of the light. This is explained by assigning two different refractive indices to the material for different polarizations. ...
출처: en.wikipedia.org/wiki/Birefringence
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