noun (n)

• persistent thickened stem of a herbaceous perennial plant(noun.plant)

  Synonym:
  stock
  

  source: wordnet30
• woody stem of palms and tree ferns(noun.plant)

  source: wordnet30
• The stem of a tree., esp. a stem without a branch, as of a palm or a tree fern; also, the perennial rootstock of an herbaceous plant.(noun)

  source: webster1913