Another indicator of the presence of medical waste, which may be used instead of or in addition to the red or orange color code, is the BIOHAZARD symbol. Medical waste from health care facilities must be treated in a way that destroys its potential for causing disease, prior to disposing it in a landfill.
In classical logic disjunctive syllogism (historically known as modus tollendo ponens) is a valid argument form which is a syllogism having a disjunctive statement for one of its premises.
difÂ·fracÂ·tion. The bending or turning of a wave, such as a light wave, when it encounters an obstacle, such as an edge, or a hole whose size is similar to the wavelength of the wave. The patterns made by the diffraction of waves can be useful for understanding the minute structures of objects.. 1. (General Physics) physics a deviation in the direction of a wave at the edge of an obstacle in its path. 2. (General Physics) any phenomenon caused by diffraction and interference of light, such as the formation of light and dark fringes by the passage of light through a small aperture.