novaculite: Meaning and Definition of

no•vac•u•lite

Pronunciation: (nō-vak'yu-līt"), [key]
— n. Petrol.
  1. a very hard sedimentary rock, similar to chert, composed essentially of microcrystalline quartz.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.