We found one dictionary that defines the word longboatman:

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1. longboatman: Wiktionary

Definitions from Wiktionary (longboatman) ▸ noun:  The man in charge of a longboat. ▸ Words similar to longboatman ▸ Usage examples for longboatman ▸ Idioms related to longboatman ▸ Wikipedia articles (New!) ▸ Popular adjectives describing longboatman ▸ Words that often appear near longboatman ▸ Rhymes of longboatman ▸ Invented words related to longboatman