Definition of nail gall in English:

nail gall

noun

  • A small conical nail-shaped gall that forms on the leaves of lime trees in response to the presence of mites.

    • ‘A fairly common phenomenon associated with lime is that of nail galls, conspicuous protrusions on lime leaves produced by mites.’
    • ‘Some galls were noted, including nail gall on lime-tree leaves growing by Low Matlock Lane.’
    • ‘In summer, greenfly on the leaves drop sticky honeydew and red nail galls can be seen on the upper leaf surface.’