(Greek: a suffix; pertaining to; of the nature of, like; in chemistry, it denotes a higher valence of the element than is expressed by -ous)

1. Lasting through time, or during an existing period.
2. In medicine, systematically observed over time in the same subjects throughout as opposed to synchronic or cross-sectional; the inferences are equivalent only where there is strict stability of all elements.
3. Pertaining to or designating a method of linguistic study concerned with the historical development of a language; historical, as opposed to descriptive or synchronic.
4. In archaeology, denoting actions or things which occur over time, as in the study of artifacts in a region as they change across sequential periods of time.
A reference to penetration through the skin.
diageotropic (adjective), more diageotropic, most diageotropic
Relating to, or exhibiting a growth movement in a plant organ so that it assumes a position at right angles to the direction of gravity.
diaphototropic (adjective)
A tendency of leaves or other organs of plants to have their outer surfaces facing towards the rays of light.
Relating to, of the nature of, or referring to, a diaphragm.
1. The name of that genus or scale of ancient Greek music in which the interval of a tone was used, the tetrachord being divided into two whole tones and a semitone (as in each half of the modern diatonic scale).
2. In modern music, denoting the scale which in any key proceeds by the notes proper to that key without chromatic alteration; hence, applied to melodies and harmonies constructed from such a scale.
diatropic (adjective), more diatropic, most diatropic
A reference to the tendency of certain plants or their parts to arrange themselves at right angles or sideways to a stimulus.
Involving or relating to the simultaneous stimulation of each ear with different sounds.
dielectric (adjective), more dielectric, most dielectric
1. A reference to material; such as, glass or porcelain with negligible electrical or thermal conductivity.
2. Pertaining to a substance or medium that can sustain a static electric field within it.
3. Relating to something that is a poor conductor of electricity, but an efficient supporter of electrostatic fields: Dielectric conditions can support an electrostatic field while dissipating minimal energy in the form of heat; frequently used in capacitors.
4. A type of insulator which becomes polarized when it comes in contact with an electrical field: The dielectric material can easily support an electrostatic field even though it is not a conductor of electricity.

Such dielectric materials are used in many places; such as, in capacitors and radios, as well as transmission lines for radio frequency and it can be used to store energy too, if it is configured properly.

Most of these dielectric materials are solid in nature, but some fluids and gasses also exhibit dielectric properties; such as gas is dry air, while examples of solid dielectric materials include mica, ceramic, plastics and glass and even distilled water is considered to be a dielectric liquid.

digastric (adjective), more digastric, most digastric
Pertaining to two small muscles located under the jaw: The term digastric muscles refer to these specific muscles which assist in lowering each of the upper and lower bony structures in vertebrates that form the framework of the mouth and containing the teeth.