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

1) To keep away from; keep clear of; shun.
2) To prevent from happening (Dictionary.com). → abstain.

M.E. avoiden, from Anglo-French avoider "to clear out, withdraw (oneself)," from O.Fr. esvuidier "to empty out," from es- "out," → ex-, + vuidier "to be empty," from voide "empty, vast, waste," from L. vocivos "unoccupied, vacant," vacare "be empty," from PIE base *eue- "to leave, abandon, give out."

Tosnidan, from Baluci tôsênag "avoid," tusag "be quenched," tôsaq "quench;" related to Pers. tohi "empty, void;" Mid.Pers. tuhig "empty;" Parthian tôšênitan "to empty;" cf. Pashto taš; Ormuri tusk; Waxi töš, təš; Sariqoli tīs; Skt. tucchá-, tucchyá- "empty;" L. tesqua "deserts;" O.Slav tušti "empty;" Russ. tošcij "meager."

Able to be avoided or prevented.

→ avoid; → -ance.

The act of avoiding or keeping away from.

→ avoid; → -ance.

Impossible to avoid.

→ avoid; → -ance.

1) An empty space; a gap or opening; emptiness. → vacuum.
2) A large region of cosmic space without galaxies. The first of these voids to be discovered lies in the direction of → Bootes and is some 300 million → light-years across. It is estimated that voids take up about 98% of the volume of the Universe, with clusters of galaxies concentrated in the thin walls that surround them.

M.E. voide, from O.Fr. voide "empty, vast, wide, hollow," from L. vocivus "unoccupied, vacant," related to vacuus "empty," → vacuum.

Tohi "empty" (variants in dialects Tabari tisâ, Saraxsi, Lâsgardi, Sangesari tusâ, Aftari tussâ); Mid.Pers. tuhig; Av. taoš- "to become empty," pres. tusa-, caus. taošaya-, tusən "they lose their posture;" cf. Skt. tuccha-, tucchya- "empty;" L. tesqua, tesca "deserted place;" Rus. tošcij "hollow;" PIE base *teus- "to empty."

A temperature range (6000-9000 K) in the → H-R diagram occupied by → yellow hypergiants in their post-RSG blueward evolution, where high → mass loss episodes occur.

→ yellow; → void.

The region on the sky covered by the plane of the → Milky Way. It is characterized by an apparent absence of galaxies, due to the obscuring effect of → interstellar dust in the → Galactic plane.

→ zone; → avoidance.