[1] : The Collaborative International Dictionary of English v.0.48

spermatophyta \sper`matoph"yta\, n. pl. nl.; spermato- + gr.
   ? plant. bot.
   a phylum embracing the highest plants, or those that produce
   seeds; the seed plants, or flowering plants. they form the
   most numerous group, including over 120,000 species. in
   general, the group is characterized by the marked development
   of the sporophyte, with great differentiation of its parts
   root, stem, leaves, flowers, etc.; by the extreme reduction
   of the gametophyte; and by the development of seeds. all the
   spermatophyta are heterosporous; fertilization of the egg
   cell is either through a

   pollen tube emitted by the microspore or in a few
      gymnosperms by spermatozoids.

   note: the phrase "flowering plants" is less distinctive than
         "seed plants," since the conifers, grasses, sedges,
         oaks, etc., do not produce flowers in the popular
         sense. for this reason the terms anthrophyta,
         phaenogamia, and panerogamia have been superseded
         as names of the phylum by spermatophyta.
         webster 1913 suppl.
see also:
pollen tube anthrophyta phaenogamia panerogamia 

[2] : The Collaborative International Dictionary of English v.0.48

pollen \pol"len\, n. l. pollen fine flour, fine dust; cf. gr.
   ?
   1. fine bran or flour. obs. --bailey.
      1913 webster

   2. bot. the fecundating dustlike cells of the anthers of
      flowers. see flower, and illust. of filament.
      1913 webster

   pollen grain bot., a particle or call of pollen.

   pollen mass, a pollinium. --gray.

   pollen sac, a compartment of an anther containing pollen,
      -- usually there are four in each anther.

   pollen tube, a slender tube which issues from the pollen
      grain on its contact with the stigma, which it penetrates,
      thus conveying, it is supposed, the fecundating matter of
      the grain to the ovule.
      1913 webster
see also:
flower filament pollen grain pollen mass pollen sac pollen tube 

[3] : WordNet (r) 2.0

pollen tube
     n : slender tubular outgrown from a pollen grain that penetrates
         the ovule and releases male gametes

Pollen Tube >> P Words
Pollen Tube, definition of term: Pollen Tube
pollen+tube_pag1.html

Pollen >> P Words
Pollen, definition of term: Pollen
pollen_pag1.html

Tube >> T Words
Tube, definition of term: Tube
tube_pag1.html

Tube Foot >> T Words
Tube Foot, definition of term: Tube Foot
tube+foot_pag1.html

Pneumatic Tube >> P Words
Pneumatic Tube, definition of term: Pneumatic Tube
pneumatic+tube_pag1.html

Thermionic Tube >> T Words
Thermionic Tube, definition of term: Thermionic Tube
thermionic+tube_pag1.html

Pitot Tube >> P Words
Pitot Tube, definition of term: Pitot Tube
pitot+tube_pag1.html

Test Tube >> T Words
Test Tube, definition of term: Test Tube
test+tube_pag1.html

Picture Tube >> P Words
Picture Tube, definition of term: Picture Tube
picture+tube_pag1.html

Capillary Tube >> C Words
Capillary Tube, definition of term: Capillary Tube
capillary+tube_pag1.html

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