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

Ecology: The environment consisting of living organisms, which interact with each other and with their non-living surroundings.

Biotic adj. of → biotics; of → environment.

The circumstances or physical conditions related to the immediate surroundings of a star.

→ circumstellar; → environment.

1) An aggregate of surrounding → circumstances, → conditions, or → influences in which a thing is situated or is developed.
2) Computers: The entire set of conditions under which one operates a → computer, as it relates to the hardware, operating platform, or operating system.
3) Ecology: The totality of circumstances surrounding an → organism or group of organisms. More specifically, the combination of external physical conditions that affect and influence the growth, development, and survival of organisms.

From environ + -ment; the first component from Fr. environs, plural of O.Fr. environ "compass, circuit," from environ (adv.) "around," from en- "in" + viron "circle, circuit," from virer "to turn."

Pargir, from par- "around, surrounding," variant pirâ-→ circum- + gir agent noun and present stem of gereftan "to take, seize; to make prisoner; to intercept" (Mid.Pers. griftan; Av./O.Pers. grab- "to take, seize;" cf. Skt. grah-, grabh- "to seize, take," graha "seizing, holding, perceiving;" M.L.G. grabben "to grab," from P.Gmc. *grab; E. grab "to take or grasp suddenly;" PIE base *ghrebh- "to seize").
Zistbum, from zist "life, existence," → bio-, + bum "region, land, place," → eco-.

A medium in which chemical elements have abundances smaller than the solar values.

→ low; → metallicity; → environment.

An environment (→ galaxy, → nebula) whose → metallicity is larger than that of the → Milky Way galaxy.

→ metal; → rich; → environment.

A description of the interstellar medium justified by the presence of supersonic shock waves, massive star winds, turbulence, supernova explosions, etc.

→ violent; → interstellar; → environment.