rā
[ rah ]
/ rɑ /
noun
the 10th letter of the Arabic alphabet.
Origin of rā
From Arabic
Definition for ra (2 of 5)
Ra
[ rah ]
/ rɑ /
noun Egyptian Religion.
a sun god of Heliopolis, a universal creator worshiped throughout Egypt (typically represented as a hawk-headed man bearing on his head the solar disk and the uraeus).
Also
Re.
Definition for ra (3 of 5)
Definition for ra (4 of 5)
RA
regular army.
Definition for ra (5 of 5)
R.A.
rear admiral.
Astronomy.
right ascension.
royal academician.
Royal Academy.
Example sentences from the Web for ra
British Dictionary definitions for ra (1 of 3)
Ra
1
the chemical symbol for
radium
British Dictionary definitions for ra (2 of 3)
Ra
2
Re
/ (rɑː) /
noun
the ancient Egyptian sun god, depicted as a man with a hawk's head surmounted by a solar disc and serpent
British Dictionary definitions for ra (3 of 3)
RA
abbreviation for
rear admiral
astronomy
right ascension
(in Britain) Royal Academician or Academy
(in Britain) Royal Artillery
Argentina (international car registration)
Word Origin for RA
(sense 5) from
República Argentina
Medical definitions for ra
Ra
The symbol for the elementradium
Scientific definitions for ra (1 of 2)
Ra
The symbol for radium.
Scientific definitions for ra (2 of 2)
radium
[ rā′dē-əm ]
Ra
A rare, bright-white, highly radioactive element of the alkaline-earth group. It occurs naturally in very small amounts in ores and minerals containing uranium, and it is naturally luminescent. Radium is used as a source of radon gas for the treatment of disease and as a neutron source for scientific research. Its most stable isotope is Ra 226 with a half-life of 1,622 years. Atomic number 88; melting point 700°C; boiling point 1,737°C; valence 2. See Periodic Table.