Definition of long tom in English:

long tom

noun

informal, historical
  • 1A large cannon with a long range.

  • 2A trough for washing gold-bearing deposits.

    • ‘On the diggings the miners were confronted with a strange new world of ‘bottoms’, ‘second bottoms’, and ‘false bottoms’, of ‘cradles’, ‘long toms’, and winzes’.’