a·stern

[uh-sturn]
adverb
1.
in a position behind a specified vessel or aircraft: The cutter was following close astern.
2.
in a backward direction: The steamer went astern at half speed.

Origin:
1620–30; a-1 + stern2

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
astern (əˈstɜːn) [Click for IPA pronunciation guide]
 
adv, —adj
1.  at or towards the stern
2.  with the stern first: full speed astern!
3.  aft of the stern of a vessel

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Astern is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Etymonline
Word Origin & History

astern
1620s, from a- "on" + stern (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
By trailing wire astern and counting revolutions, one can determine distances.
It employs an underwater towed body acoustic projector, which is towed astern
  of the host ship by a fiber optic tow cable.
The wounded had been dragged to the after-torpedo room, the compartment
  farthest astern.
The annual validation decals must be affixed within six inches astern of the
  registration number.
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