noun, genitive Octantis [ok-tan-tis] . Astronomy.
the Octant, a southern constellation that contains the south celestial pole.

< Late Latin: eighth part of a circle, equivalent to oct- oct- + -āns, as in quadrāns quadrant

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World English Dictionary
Octans (ˈɒktænz)
n , Latin genitive Octantis
a faint constellation in the S hemisphere in which the S celestial pole is situated

Collins English Dictionary - Complete & Unabridged 10th Edition
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Medical Dictionary

octan oc·tan (ŏk'tān')
Occurring every eighth day. Used of a recurring fever.

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