from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Cleaving in more than one direction, parallel to the axis.
from the GNU version of the Collaborative International Dictionary of English
- adj. Cleaving in more directions than one, parallel to the axis.
from The Century Dictionary and Cyclopedia
- In mineralogy, cleaving in more directions than one parallel to the axis, the faces being all similar.
Ancient Greek, "cut off all around". See peri- and tome. (Wiktionary)