Orkhus (Arhus), shahr va bandarest dar Daniya, dar sharqi nimjazirai Yut­landiya, dar sohili khaliji Orkhus-Bugt. Markazi mamurii amti Orkhus. Aholiash 246 hazor nafar (1974). Uzeli rohi ohan, markazi savdoyu sanoat va madaniyat. Makhsusan sanoati moshinsozi (tajhizot, yakhdonho), istehsoli mahsuloti neft, sanoati khimiya, bofandagi, khurokvori rivoj yoftaast. Universitet (az 1928), Maktabi …

Ornitozho (az yunoni ornis, ornithos — parranda), yak guruhi bemorihoi virusii parranda va odamro guyand. Ornitozho avvalin bor soli 1875 ilman qalamdod shudaast. Siroyati Ornitozho dar beshtar az 130 namudi parrandaho muqarrar karda shudaast, ki in ba «ornitoz» nomidani bemori vodor namud. Angezandai Ornitozho virusest, ki az najosat va luobi …

Orsha, shahrest dar viloyati Vitebski Respublikai Sovetii Sotsialistii Bulgoriya, dar sohili daryoi Dnepr. Uzeli kaloni rokhi ohan.  Az Orsha avtomagistrali Leningrad — Kiev meguzarad. Aholiash 112 hazor nafar (1979). Kombinati katon, fabrikahoi trikotaj, duzandagi,_zavodhoi dastgohsozi, moshinhoi darzduzi, asbobsozi, silikat, konstruksiyahoi ohanu betoni, korkhonahoi sanoati khurokvori (kombinati gushtu konserv, zavodhoi panir, …

Ornitologiya (az yunoni ornis, ognithos—parranda va … logiya), yak sohai zoologiya ast, ki embriologiya, morfologiya, fiziologiya, ekologiya, sistematika va taqsimoti geografii parrandahoro meomuzad. Nakhustin asar oid ba Ornitologiya— «Tarikhi hayvonot» ba qalami Arastu (asri 4 to milod) taalluq dorad. U dar asarash dar borai 170 namudi parranda malumot dodaast. Asosi …

Ori Saidahmad ibni Shohabduradim (1884—1918, Qalaikhum), shoiri tojik. Dar Darvoz ba dunyo omada, hamon jo kasbi kamol kardaast. Dar sheru shoiri shavqu zavqi ziyode doshta, sherhoyash dar bayni khalq mamulu maqbul gashtaand. Ashori Ori dar bayozu majmuahoi qa­lami darj gardidaand.

Ornitokhoriya (az yunoni ornithos— parranda va choreo — meravam, pahn meshavam), tavassuti parrandaho pahn shudani meva va tukhmi rastanihost. Yak juzi zookhoriya. Parrandaho meva va tukhmi rastanihoro bo changol yo nuli khud burda, dar surokhii kundaho, zeri khasu shibbahoi lonan khud va gayra pinhon va zakhira menamoyand. Tukhmi rastaniho dar …

Shahri Vladikavkaz in poytakhti Respublikai Osetiya Shimoli meboshad va onro peshtar (to 1931 — Vla­dikavkaz, az 1944 to 1954— Dzaujikau va 1955-1990 Orjonikidze) menomidand. Masohati shahr 291 km² meboshad.  Dar sohili daryoi Terek voqe ast. Aholiash 1 millionu 80 hazor nafar dar 2017 sol dosht. Vladikavkaz kalontarin markazi sanoat va madaniyati respublika meboshad. Sohahoi muhimi sanoati …

Orogen (az yunoni oros — kuh va …gen), marhilai duyumi inkishofi geosinklinalhost (zonahoi az jihati tektoniki serharakati qishri Za­min). Dar in marhila qishri Zamin bolo bardoshta shuda, kuhho ba vujud meoyand. Istilohi Orogenro soli 1921 geologi avstriyagi L. Kober ba ilm dokhil kardaast. Muvofiqi aqidai u Orogen dar bayni massahoi …

Orjonikidze, qulla dar Pomir, dar shokhai janubi sharqii qatorkuhi Akademiyai Fanho. 8 kilometr sharqtar az qullai Kommunizm voqe ast. Balandiash 6346 metr (az rui malumothoi digar 6280 metr). Nishebihoyash bo piryakhu barfhoi bisyorsola pushida shudaand. Ba sharafi G. K. Orjonikidze nomidaand. Qullaro bori avval 28 avgusti 1937 ishtirokchiyoni ekspeditsiyai Pomir …

Orogenez, orogenezis (yunoni oros — kud va …askez), kuhpaydoshavi, harakathoi kuhpaydoshaviest, ki dar nohiyahoi geosinkli­nali az tasiri massahoi tazyiqovar ba amal meoyand. Istilohi «Orogenez»- ro soli 1890 geologi amerikoi G. Dil­bert ba ilm jori namud. Avvalho chunin meshumoridand, ki az Orogenez jinho va kuhho paydo meshavand. Ba fikri olimoni soveti …