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

1) The process of becoming visible after being concealed.
2) The escape of an insect or other invertebrate from an egg, cocoon, or pupal case.
3) The process of coming into existence or prominence (OxfordDictionaries.com).

→ emerge; → -ence.

1) Coming into being or notice.
2) Philo.: (of a property) arising as an effect of complex causes and not analyzable simply as the sum of their effects.
3) Ecology: Of or denoting a plant which is taller than the surrounding vegetation, especially a tall tree in a forest (OxfordDictionaries.com).

→ emerge; → -ent.

Optics: The → light ray leaving a → medium, in contrast to the → incident ray. If the medium has parallel sides, → angle of incidence and → angle of emergence

→ emergent; → ray.

Astro.: Same as → egress.

→ emerge.

A person who emigrates, as from his or her native country or region (Dictionary.com).

→ emigrate + -ant a suffix forming adjectives and nouns from verbs.

To leave one country or region to settle in another; migrate.

→ ex-; → migrate.

An act or instance of emigrating; a body of emigrants; emigrants collectively.

Verbal noun of → emigrate.

In an atom, a characteristic amount of energy radiated (as line emission) when an electron moves from an outer orbit to an inner orbit around the nucleus, corresponding to the lost energy of the electron.

From L. emissionem "a sending out," from emiss-, stem of emittere "send forth," from → ex- "out" + mittere "to send."

Gosil, variant gosi "sending away, dismission;" Mid.Pers. wisé "to despatch" (Parthian Mid.Pers. wsys- "to despatch;" Buddhist Mid.Pers. wsydy "to despatch;" Sogdian 'ns'yd- "to exhort"), from Proto-Iranian *vi-sid- "to despatch, send off," from prefix vi- "apart, away, out," + *sid- "to call."

In a spectrum, a combination of several closely spaced, often unresolved, → emission lines occurring across a limited range of wavelengths.

→ emission; → band.

Electromagnetic flux emitted by a source per unit volume per unit time.

→ emission; → coefficient.

Any emission mark in the spectrum of a celestial object resulting from line formation or of unknown origin.

→ emission; → feature.

A bright line in the electromagnetic spectrum of a radiating substance caused by emission at a particular wavelength.

→ emission; → line.

The product of the square of the electron density times the linear size of the emitting region (in parsecs).

→ emission; → measure.

An ionized nebula whose spectrum consists of → emission lines. → planetary nebula; → H II region.

→ emission; → nebula.

A spectrum consisting of emission lines, produced when the light does not undergo absorption between the source and the spectrograph.

→ emission; → spectrum.

1) Able to emit (radiation, light, or heat).
2) Pertaining to → emission.

Verbal adj. from → emit.

The energy emitted from unit surface area of body per second.

→ emissive; → power.

The ratio of energy radiated by a material to energy radiated by a black body at the same temperature.

→ emissive + → -ity.

To send forth (liquid, light, heat, sound, particles, etc.).

Verb of → emission.

Gosilidan, infinitive of gosil, → emission.

Any device used to emit light, sound, electrons, or the like.

Agent noun of → emit.