October Revolution
— Noun
– English
～ the coup d'etat by the Bolsheviks under Lenin in November 1917 that led to a period of civil war which ended in victory for the Bolsheviks in 1922
Oedipus Rex
— Noun
– English
～ (Greek mythology) a tragic king of Thebes who unknowingly killed his father Laius and married his mother Jocasta; the subject of the drama `Oedipus Rex' by Sophocles
order Rhamnales
— Noun
– English
～ an order of dicotyledonous plants
order Rheiformes
— Noun
– English
～ a ratite bird order: birds intermediate in characteristics between ostriches and emus: recent and extinct rheas
order Rhoeadales
— Noun
– English
～ an order of dicotyledonous plants
order Rhynchocephalia
— Noun
– English
～ tuataras; extinct forms from middle Triassic
Omani rial
— Noun
– English
～ the basic unit of money in Oman
order Rickettsiales
— Noun
– English
～ pleomorphic Gram-negative microorganisms
olive ridley
— Noun
– English
～ olive-colored sea turtle of tropical Pacific and Indian and the southern Atlantic oceans
oil rig
— Noun
– English
～ rig used in drilling for oil or gas
offshore rig
— Noun
– English
～ drilling rig consisting of an offshore platform (floating or fixed to the sea bed) from which many oil wells can be bored radially
oil rigger
— Noun
– English
～ someone who works on an oil rig
ottava rima
— Noun
– English
～ a stanza of eight lines of heroic verse with the rhyme scheme abababcc
orange rind
— Noun
– English
～ the rind of an orange
O ring
— Noun
– English
～ a gasket consisting of a flat ring of rubber or plastic; used to seal a joint against high pressure
O-ring
— Noun
– Danish
～ gummiring med rundt tværsnit, brugt som pakning e. ...
Ob River
— Noun
– English
～ a major river of western Siberia; flows generally northward and westward to the Gulf of Ob and the Kara Sea