1. A valuable object that has belonged to a family for several generations
The diamond ring was a cherished heirloom passed down from her grandmother.
O anel de diamante era uma herança de família muito querida, passado de sua avó.
2. In agriculture, a variety of plant or crop that has been maintained for many generations
These heirloom tomatoes are grown using traditional farming methods.
Estes tomates heirloom são cultivados usando métodos agrícolas tradicionais.