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

Not secure; exposed or liable to risk, loss, or danger.

→ in-; → security.

An image defect caused by the mechanical flexure of materials; for example the curved-shape image of a long slit in a spectrograph.

→ instrumental; → flexure.

The mathematical form of the way an instrument affects the input signal.

→ instrumental; → response; → function.

1) To provide or obtain → insurance on or for.
2) Make certain that something is definitely so. Same as make sure and ensure.

Variant of → ensure.

1) Bimé kardan, from bimé, → insurance, + kardan "to do, make," → -ize.
2) Dartenzidan, from dar-, → in-, + tenz, → sure, + -idan infinitive suffix, → -ize.

A prefix that highly emphasizes roots of words to which it is attached. In other words, intensive prefixes heighten the force of the primary meanings of words. These prefixes can effectively be translated as "thoroughly" to highlight their intensive function. For example the prefixes → re-, → de-, and → com-.

→ intensive; → prefix.

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.

1a) The sense of curiosity about or concern with something or someone.
1b) Something in which one is interested.
1c) A right, share, or claim in a business or property.
2) To engage or excite the attention or curiosity of.

M.E., from M.L. from L. interest "it concerns," from M.L. interesse "compensation for loss," noun use of L. interesse "to concern, make a difference, be of importance," literally "to be between," from → inter- "between" + esse "to be," → entity.

Andarast, coined (Adib-Soltani) on the model of the L. word, as above, from andar "between," → inter-, + ast variant hast "is, exists," → entity.

Having an interest in something; having the attention engaged; being affected or involved.

P.p. of → interest.

Inspiring interest, holding the attention.

Adj. from → interest.

Physics: To cause → interference.

Interfere, from M.Fr. entreferer "to strike each other," from entre, → inter-, + ferir "to strike," from L. ferire "to knock, strike."

Andarzadan, from andar, → inter-, + zadan "to strike, beat," from Mid.Pers. zatan, žatan; O.Pers./Av. jan-, gan- "to strike, hit, smite, kill" (jantar- "smiter"); cf. Skt. han- "to strike, beat" (hantar- "smiter, killer"); Gk. theinein "to strike;" L. fendere "to strike, push;" Gmc. *gundjo "war, battle;" PIE *g^when- "to strike, kill."

The phenomenon occurring when two or more waves of the same → frequency having a constant → phase difference traverse simultaneously in the same region of a medium and cross each other. In the region of superposition, the the resulting wave intensity is different from the sum of intensities due to individual waves at that point. This phenomenon proved the validity of the wave theory of light. See also → constructive interference, → destructive interference, → interference fringe, → Young's experiment, → wave theory of light.

Interference, from → interfere + -ence a noun suffix equivalent to -ance, corresponding to the suffix -ent in adjectives.

Andarzaneš, verbal noun of andarzadan, → interfere.

A filter that uses the phenomenon of optical interferences between plane-parallel semi-transparent reflectors to transmit light selectively over a narrow wavelength band.

→ interference; → filter.

One of the alternating bright or dark bands produced by optical interference.

→ interference; → fringe.

→ order of interference.

→ interference; → order.

A wave pattern that results when two or more waves interfere with each other, generally showing → interference fringes. In acoustics, the interference pattern appear as the effect of → beats.

→ interference; → pattern.

In a → superheterodyne receiver, a frequency resulting from the combination of the received modulated → carrier frequency and the → local oscillator frequency.

→ intermediate; → frequency.

The infrared radiation with wavelengths between about 1.5 and 20 microns. → near infrared; → far infrared.

→ intermediate; → infrared.

A unidirectional electric current that flows and ceases to flow at irregular or regular intervals.

→ intermittent; → current.

The physical characteristics of that part of a star lying below the → photosphere. More specifically, the study of its various zones (→ core, → convective zone, → radiative zone) and the transfer of energy through them.

→ internal; → structure; → star.

A satellite dedicated to spectroscopic observations of astronomical objects in ultraviolet wavelengths, launched in 1978. It was an international collaboration between → NASA, the → European Space Agency (ESA), and the United Kingdom's Science and Engineering Research Council. It operated until September 1996 and collected over 70,000 spectra. IUE consisted of a 45-cm telescope (f/15) equipped with two spectrographs operating in the ranges 1850-3300 Å and 1150-2000 Å. Each spectrograph had a high-resolution and a low-resolution mode with resolutions of about 0.2 Å and 6 Å respectively.

→ international; → ultraviolet; → explorer.