A decanter was a vessel used to decant liquid (generally alcohol) into, it was mostly made of glass or crystal.
The Doctor kept Aldebaran brandy in a decanter in the TARDIS. (TV: Twice Upon a Time [+]Steven Moffat, Doctor Who Christmas Special 2017 (BBC One, 2017).) They could contain various alcohols like gin, sherry, port and whisky. (PROSE: Genocide [+]Paul Leonard, BBC Eighth Doctor Adventures (BBC Books, 1997)., Camera Obscura [+]Lloyd Rose, BBC Eighth Doctor Adventures (BBC Books, 2002)., The Clockwise Man [+]Justin Richards, BBC New Series Adventures (BBC Books, 2005)., Damaged Goods [+]Russell T Davies, Virgin New Adventures (Virgin Books, 1996).) And juices like nectarine. (PROSE: The Dimension Riders [+]Daniel Blythe, Virgin New Adventures (Virgin Books, 1993).)
A tantalus could hold two decanters. (PROSE: The Clockwise Man [+]Justin Richards, BBC New Series Adventures (BBC Books, 2005).)
Edward Waterfield had decanters of wine in his home in 1866 filled with Marsala, white wine and red wine (PROSE: The Evil of the Daleks [+]John Peel, adapted from The Evil of the Daleks (David Whitaker), Publication Order (Target Books, 1993).)
George Litefoot had a crystal decanter in his home. (TV: The Talons of Weng-Chiang [+]Error: Code 2 - no data stored in variables, cache or SMW., PROSE: The Bodysnatchers [+]Mark Morris, BBC Eighth Doctor Adventures (BBC Books, 1997).)
Count Scarlioni had a decanter and glasses on a table in his home in Paris. (TV: City of Death [+]David Agnew, Doctor Who season 17 (BBC1, 1979).)
There was a decanter of port in Downing Street in 2006. (TV: World War Three [+]Russell T Davies, Doctor Who series 1 (BBC One, 2005).)
Iris Wildthyme likened placing her memories into the Memory Crystal like pouring brandy into a decanter. (AUDIO: Wildthyme at Large)