leatherjacket

noun4

1. •
   The larva of certain crane flies.
2. •
   Any of several brightly coloured tropical fishes, of the family Balistidae, including the filefish and the triggerfish; leatherfish.
3. •
   Any of several Atlantic fishes, of the genus Oligoplites, that have a leathery skin; leatherjack.
4. •
   (no longer used) grey gum (Eucalyptus punctata).