A proportion used in determining the dimensional relationship of a representation to that which it represents: a world map with a scale of 1:4,560,000. b. A calibrated line, as on a map or an architectural plan, indicating such a proportion.
Yttria (yttrium oxide, Y 2 O 3), was discovered by Johann Gadolin in 1794 in a mineral called gadolinite from Ytterby. Ytterby is the site of a quarry in Sweden which contains many unusual minerals containing erbium, terbium, and ytterbium as well as yttrium.
Syphilis is a type of sexually transmitted disease (STD) caused by an infection of the bacterium Treponema pallidum. Syphilis can also be spread to a fetus by an infected mother during pregnancy.yphilis is a type of sexually transmitted disease (STD) caused by an infection of the bacterium Treponema pallidum. Syphilis can also be spread to a fetus by an infected mother during pregnancy.