from the GNU version of the Collaborative International Dictionary of English

  • n. A former name for a euphorbiaceous genus (Hevea) of South American trees, the principal source of caoutchouc.

from The Century Dictionary and Cyclopedia

  • n. Plural of siphonium.
  • n. A genus of pear-shaped, silicious, lithistid sponges with a long or short peduncle, the interior having a deep cloaca and numerous arched canals. It abounds in the Cretaceous rocks.


Sorry, no etymologies found.


Wordnik is becoming a not-for-profit! Read our announcement here.


Log in or sign up to get involved in the conversation. It's quick and easy.