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Alpha Crucis

Definition of the noun alpha crucis

What does alpha crucis mean as a name of something?


  1. the brightest star in the Southern Cross
    • lexical domain: Natural Objects - nouns denoting natural objects (not man-made)
    • instance of: star = a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
    • member of: Crux / Crux Australis / Southern Cross = a small conspicuous constellation in the southern hemisphere in the Milky Way near Centaurus


  1. Alpha Crucis is the brightest star in the constellation Crux, the Southern Cross, and, at a combined visual magnitude 0.77, is the 13th brightest star in the night sky. Acrux is the southernmost first-magnitude star, just a little more southerly than Alpha Centauri.
    • also known as Acrux AB
  2. Alpha Crucis is the most recent oceanographic research vessel in Brazil, replacing the older Wladimir Besnard research vessel. It is named after the star that represents São Paulo state in the Brazilian flag. It is 64 meters long and 11 meters wide, and has capacity for 25 researchers and 15 and is capable of remaining 40 days without being resupplied.

Printed dictionaries and other books with definitions for Alpha Crucis

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Google previewA Dictionary of Astronomy (2012)

by Ian Ridpath

Alpha Crucis The brightest star in the constellation Crux, also called Acrux. It is a double star consisting of a B0.5 subgiant, magnitude 1.3, and a B1 dwarf, magnitude 1.7. To the naked eye they appear as a single star of magnitude 0.8. Alpha ...

Google previewMacmillan Dictionary of Astronomy (1985)

by Valerie Illingworth

Alpha Crucis (Acrux; o Cru) . A conspicuous white subgiant that is the brightest star in the constellatiqn Crux ...

Google previewThe Facts on File Dictionary of Astronomy (2009)

by John Daintith, William Gould

Alpha Crucis /kroo-sis/ (Acrux; αα Cru) A conspicuous white star that is the brightest in the constellation Crux. It is a visual binary (separation 4′′), both components being spectroscopic binaries.

Google previewA Dictionary of Science (2017)

by Jonathan Law

Alpha Crucis, Delta Cephei). Generally, α (alpha) signifies the brightest star, β ( beta) the second brightest, etc. When the 24 letters of the Greek alphabet are ...

Google previewAllen's Dictionary of English Phrases (2008)

by Robert Allen

Alpha Crucis Trucanini's Dirge ...

Google previewVan Nostrand’s Scientific Encyclopedia (2013)

by Douglas M. Considine, Glenn D. Considine

ALPHA CRUCIS. Ranking thirteenth in apparent brightness among the stars, ...

Google previewAcademic Press Dictionary of Science and Technology (1992)

by Christopher G. Morris, Academic Press

Alpha Crucis see Acrux. alpha cutoff (frequency) Electronics, in a common-base configured transistor, the high frequency at which alpha drops 3 decibels from its low-frequency value. Alpha Cygni [sig'ne] see Deneb. alpha decay Nuclear ...

Google previewCompton's Pictured Encyclopedia (1922)

To Inspire Ambition, to Stimulate the Imagination, to Provide the Inquiring Mind with Accurate Information Told in an Interesting Style, and Thus Lead Into Broader Fields of Knowledge, Such is the Purpose of this Work by Guy Stanton Ford

*Canopus, "Alpha Centauri, Vega, Capella, Arcturus, Rigel, Procyon, Achernar, "Beta Centauri, Betelguese, Altair, "Alpha Crucis, Aldebaran, Pollux, Spica, Antares, Fomalhaut, Deneb, and Regulus. (Those marked with an asterisk (*) cannot ...

Google previewOxford Dictionary of English (2010)

by Angus Stevenson

Acrux /'eIkrAks/ Astronomy the star Alpha Crucis, which is the brightest star in the southern constellation Crux and the twelfth brightest in the sky. — ORIGIN from A for alpha + CRUX. acrylamide /a'krilamAId/ > noun [mass nou:'] Chemistry a ...

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Alpha Crucis

N/Oc. Alpha Crucis

Photo credit: Jemps

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