An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

An equation involving an unknown function that appears as part of an integrand.

→ integral; → equation.

A function whose image is a subset of the integers, i.e. that takes only integer values.

→ integral; → function.

The branch of electronics that deals with integrated circuits, especially the interdependence of material, circuits, and design.

Integrated, p.p. of → integrate; → electronics.

In calculus the operation which consists of finding the areas enclosed by curves through the summations of infinitesimals. The inverse process of differentiation.

Verbal noun of → integrate.

The time during which a detector integrates the incoming photons.

→ integration; → time.

The action of making or becoming stronger or more extreme.

verbal noun of → intensify.

The rate of emitted energy from unit surface area through unit solid angle. The radiation from a surface has different intensities in different directions.

→ intensity; → radiation.

General: Mutual or reciprocal action or influence.
Physics: 1) What happens between a system and its surroundings when an observable change in one corresponds to or correlates with an observable change in the other.
2) The natural phenomenon of the transfer of energy between two particles. The four known kinds of interactions, in the order of increasing strength, are: → gravitational, → weak, → electromagnetic, and → strong.

Interaction, from → inter-; + → action.

Capable of acting on or influencing each other

From → interaction; + → -al.

A low-density region separating the spiral arms of a galaxy.

Interarm, from → inter- + arm "body part," from O.E. earm "arm," from P.Gmc. *armaz (cf. M.Du., Ger. arm, O.N. armr, O.Fris. erm), from PIE base *ar- "to fit, join;" Mod.Pers. arm "arm, from the elbow to the shoulder;" Av. arma-, arəmo- "arm;" Skt. irma- "arm;" Gk. arthron "a joint," L. armus "shoulder;" → region.

Andarbâzu, from andar-, → inter-, + bâzu "arm," from Mid.Pers. bâzûk "arm;" Av. bāzu- "arm;" cf. Skt. bāhu- "arm, forearm;" Gk. pechys "forearm, arm, ell;" O.H.G. buog "shoulder;" Ger. Bug "shoulder;" Du. boeg; O.E. bôg, bôh "shoulder, bough;" E. bough " a branch of a tree;" PIE *bhaghu- "arm"); nahiyé, → region. Andararm, from andar-, → inter-, + arm, as above.

The act of intercalating; insertion. Something that is intercalated.
Astro.: An insertion into a calendar, → intercalate.
Geology: The presence of a body of rock interbedded with another body of different rock.

The verbal noun of → intercalate.

To be or become connected reciprocally.

→ inter- + → connect.

Reciprocal connection between two or several things.

→ andar-; → connection.

In spectroscopy, same as → semi-forbidden line.

→ interconnection; → line.

→ Absorption features in the spectra of bright sources like → quasars attributed to a tenuous matter filling the medium between galaxies.

→ intergalactic; → absorption.

A hypothetical → elementary particle that mediates the → weak interaction, carrying its effect from one particle to another as the photon does for electromagnetic interactions. First introduced in 1961 by Sheldon Glashow.

→ intermediate; → boson.

Of an → H II region, the absorption of photons by the dust which is mixed with ionized gas, in contrast to the absorption by the → interstellar dust on the line of sight.

→ internal; → absorption.

A → radiationless relaxation process in which a molecule in some excited → electronic state converts to a state of the same → multiplicity but of lower electronic energy and in which the lost electronic energy is converted initially into vibrational energy.

→ internal; → conversion.

Verbal noun of → internalize.

→ internalize + → -tion.

Between or among → nations; involving two or more nations. → International Astronomical Union, → International Atomic Time, → International Date Line, and so forth.

International, from → inter- + nation, from O.Fr. nacion, from L. nationem (nom. natio) "nation, stock, race," literally "that which has been born," from natus, p.p. of nasci "be born;" cognate with Pers. zâdan→ generate, + → -al.

Jahâni "of or relating to the world" (Fr. mondial), → world.
Andarnafâni, from andar-, → inter-, + nafâni, adj. of nafân "family relation; kinship," proposal for "nation," from naf, from Mid.Pers. nâf "family," nâfag "navel," naft "descendant," Parthian n'p "family" (Mod.Pers. nâf "navel"); Av. nāfa- "navel, near relationship, family," hama.nāfaēna- "of the same family;" cf. Skt. nábhya- "hub (of wheel);" Gk. omphalos "navel;" L. umbilicus "navel;" O.H.G. nabalo "navel;" Ger. Nabel "navel" + -ân suffix denoting family relationship, as in Bâbakân "family of Bâbak."