
1) Augury 2) Auspice 3) Foreboding 4) Forerunner 5) Forewarning 6) Omen 7) Prodigy 8) Prognostication 9) Sign
Found on
https://www.crosswordclues.com/clue/portent

1) Augury 2) Early indication 3) Foretoken 4) French word used in English 5) Omen 6) Omen marvelous threatening 7) Preindication 8) Presage 9) Prodigy 10) Prognostic 11) Prognostication 12) Sign 13) Sign left ten disturbed 14) Sign of the future 15) Sign to heed 16) Writing on the wall
Found on
https://www.crosswordclues.com/clue/portent

• (n.) That which portends, or foretoken; esp., that which portends evil; a sign of coming calamity; an omen; a sign.
Found on
http://thinkexist.com/dictionary/meaning/portent/
Por·tent' noun [ Latin
portentum . See
Portend .] That which portends, or foretoken; esp., that which portends evil; a sign of coming calamity; an omen; a sign.
Shak. « My loss by dire
portents the god foretold.»
Dryden. Found on
http://www.encyclo.co.uk/webster/P/130

omen marvelous threateningÂ
Found on
http://www.graduateshotline.com/list.html

The USS Portent was an American Auk Class minesweeper of 890 tons displacement launched and lost during the Second World War. The USS Portent was powered by diesel engines providing a top speed of 18 knots and carried a complement of 105. She was armed with one 3 inch dual-purpose gun and two 40 mm anti-aircraft guns.
Found on
http://www.probertencyclopaedia.com/browse/RP.HTM

portent 1. Something that portends an event about to occur, especially an unfortunate event; omen. 2. A portending; a significance.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1754/
No exact match found.