pop·pet

[pop-it]
noun
1.
Also called poppet valve. Machinery. a rising and falling valve consisting of a disk at the end of a vertically set stem, used in internal-combustion and steam engines.
2.
British Dialect. a term of endearment for a girl or child.
3.
Nautical. any of the vertical timbers bracing the bow or stern of a vessel about to be launched.

Origin:
1300–50; Middle English; earlier form of puppet

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To poppet
00:10
Poppet is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
poppet (ˈpɒpɪt) [Click for IPA pronunciation guide]
 
n
1.  a term of affection for a small child or sweetheart
2.  Also called: poppet valve a mushroom-shaped valve that is lifted from its seating against a spring by applying an axial force to its stem: commonly used as an exhaust or inlet valve in an internal-combustion engine
3.  nautical a temporary supporting brace for a vessel hauled on land or in a dry dock
 
[C14: early variant of puppet]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

poppet
"small human figure used in witchcraft and sorcery," c.1300, early form of puppet (q.v.). Meaning "small or dainty person" is recorded from late 14c.; later a term of endearment.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Slowly open the bleed valve of the test kit, and observe and record the psi
  when the air inlet poppet opens.
Tests were performed on mushroom, annular, flap and poppet type exhalation
  valves.
During the remainder of the open stroke, the internal poppet lifts the main
  poppet and retracts it to the fully open position.
The vapor adaptor poppet shall not leak when closed.
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