Dredger (noun)

1. A machine or vessel used to remove material from the bottom of a body of water.
2. A person who works on or operates a dredger.

Origin:

Mid 19th century, from the verb 'to dredge' + -er.

Examples:

1. The dredger was brought in to remove the mud from the riverbed.
2. The dredger operator has years of experience in his field.
3. The harbor needed to be deepened, so a dredger was employed.
4. The dredger worked around the clock to complete the job on time.
5. The dredger was a crucial component of the harbor's maintenance.