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

The → range of → wavelengths or frequencies (→ frequency) at which a → detector is sensitive. Same as → bandwidth.

→ spectral; → coverage.

A single step or phase in an ongoing process.

M.E., from O.Fr. estage "a story or floor of a building, stage for performance," from V.L. *staticum "a place for standing," from L. statum, p.p. of stare "to stand."

Gâmé, from gâm "step, pace" (related to âmadan "to come"); Mid.Pers. gâm "step, stride, pace;" O.Pers. gam- "to come; to go;" Av. gam- "to come; to go," jamaiti "goes;" cf. Skt. gamati "goes;" Gk. bainein "to go, walk, step;" L. venire "to come;" Tocharian A käm- "to come;" O.H.G. queman "to come;" E. come; PIE stem *gwem- "to go, come."

A prehistoric period during which the main material used to make tools and weapons was stone. The Stone Age is usually divided into three separate periods (Paleolithic Period, Mesolithic Period, and Neolithic Period) based on the degree of sophistication in the fashioning and use of tools. The Paleolithic time period is by far the longest, beginning some two million years ago and ending around 10,000 BC to coincide with the end of the last ice age (Pleistocene epoch).

→ stone; → age.

A part of a larger image.

→ sub-; → image.

A language in which the phrase meaning is determined by case endings of individual words and not by the relation between the words. Old English was a highly synthetic language. Compare with → analytic language.

→ synthetic; → language.

A person in charge of the configuration and administration of a multi-user computer system inside a network.

→ system; → manager.

A → software → utility that enables a → user to view each of the tasks currently running on the → computer, each of the → processes, and the overall performance of the computer.

→ task; → manager.

The locus of stars on the → Hertzsprung-Russell diagram that are at the point of exhausting hydrogen in their cores. TAMS forms the upper luminosity boundary of the → main sequence strip. See also → zero age main sequence (ZAMS).

→ terminal; → age; → main; → sequence.

One of the → orbital elements, the time when the → secondary body reaches → periapsis.

→ time; → periapsis; → passage.

An image in which finer details are not visible. → blurred image

→ un-; → sharp image.

A small group of dwellings in a rural area, usually ranking in size between a hamlet and a town.

M.E. village, from O.Fr. village, from L. villaticus, ultimately from L. villa "country house," related to vicus "village, group of houses," vecinus "neighbor;" cf. Mid.Pers. wis "village," Manichean Mid.Pers. wys "to repose;" Khotanese bäsā "house;" O.Pers. viθ- "settlement;" Av. vis- "to enter;" cf. Skt. vis- "house;" Albanian vis- "place;" Gothic weihs "village;" E. suffix wich, -wick (as in Norwich and Brunswick); Iranian dialects/languages Xonsâri hos "house, home;" Lori, Laki hoš, höš, hovš "house, home;" Baluci ges "house, home;" Kermânshahi, Ilâmi, Lori huz "clan, family, tribe;" Parachi γos, γus "house, home;" Wakhi wiš- / wišt- "to set [of sun];" Yaghnavi wes-, ves- "to go down;" PIE *ueik- "to settle (down)."

Deh, dehkadé, from Mid.Pers. dêh "village, settlement, country;" loaned into Armenian deh "district;" O.Pers./Av. dahyu- "country."

Optics: An image formed inside an instrument at the point where diverging rays would cross if they were extended backward into the instrument. Such an image cannot be obtained on a screen placed at its apparent position, since the rays do not pass through that point. → real image.

→ virtual; → image.

The electric potential difference expressed in volts.

From → volt.

1) Act of wrecking; state of being wrecked.
2) Remains or fragments of something that has been wrecked.

→ wreck + suffix -age forming mass and abstract nouns.

A star that has arrived on the → horizontal branch after leaving the → red giant branch. It begins → helium burning in its core.

→ zero; → age; → horizontal; → branch; → star.

The position on the → Hertzsprung-Russell diagram for newborn stars which have just started → hydrogen burning in their cores. The ZAMS forms the lower luminosity boundary of of the → main sequence strip. See also → terminal age main sequence (TAMS).

→ zero; → age; → main sequence.