Definitions

1. noun

a device used to ventilate the hold of a ship by admitting fresh air through a pipe, especially in the 18th century

“The old ship’s manual mentioned the use of a smokejack to improve airflow.”

2. noun

a chimney or flue that allows smoke to escape from a building, especially a ship

“The smokejack on the old house was clogged, causing the chimney to malfunction.”