premorse

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Abruptly truncated, as though bitten or broken off.

from The Century Dictionary.

• Bitten off.
• In botany and entomology, having the apex irregularly truncate, as if bitten or broken: as, a premorse leaf or root; premorse elytra; etc.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Terminated abruptly, or as it bitten off.
• adjective (Bot.) such as have an abrupt, ragged, and irregular termination, as if bitten off short.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective botany Terminated abruptly, or as if bitten off.