From The Collaborative International Dictionary of English v.0.48:
Poppy \Pop"py\, n.; pl. Poppies. [OE. popy, AS. popig, L.
papaver.] (Bot.)
Any plant or species of the genus Papaver, herbs with showy
polypetalous flowers and a milky juice. From one species
(Papaver somniferum) opium is obtained, though all the
species contain it to some extent; also, a flower of the
plant. See Illust. of Capsule.
[1913 Webster]
California poppy (Bot.), any yellow-flowered plant of the
genus Eschscholtzia.
Corn poppy. See under Corn.
Horn poppy, or Horned poppy. See under Horn.
Poppy bee (Zool.), a leaf-cutting bee (Anthocopa
papaveris) which uses pieces cut from poppy petals for
the lining of its cells; -- called also upholsterer bee.
Prickly poppy (Bot.), Argemone Mexicana, a
yellow-flowered plant of the Poppy family, but as prickly
as a thistle.
Poppy seed, the seed the opium poppy (Papaver
somniferum).
Spatling poppy (Bot.), a species of Silene (Silene
inflata). See Catchfly.
[1913 Webster] Poppy
From The Collaborative International Dictionary of English v.0.48:
Poppy \Pop"py\, Poppyhead \Pop"py*head`\, n. [F. poup['e]e doll,
puppet. See Puppet.] (Arch.)
A raised ornament frequently having the form of a final. It
is generally used on the tops of the upright ends or elbows
which terminate seats, etc., in Gothic churches.
[1913 Webster]