What is the meaning of Dry_nurse?

A nurse who takes care of a baby, but does not breastfeed.

An inferior officer who carries on the duty on board ship, due to the captain's ignorance of seamanship.

To feed, attend, and bring up without suckling.

Of an inferior officer: to carry on the duty on board ship, due to the captain's ignorance of seamanship.

Source: wiktionary.org