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pta.
ptarmigan
PTC
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pteranodon
pteridology
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pteridosperm
pte·rid·o·sperm [ tə ríddə spùrm, térrədə spùrm ] (plural pte·rid·o·sperms)


noun 
Definition:
 
extinct seed-bearing fern: an extinct plant that bore seeds and resembled a fern
[Early 20th century. < Greek pterid- "fern"]
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