MIDSHIPMAN'S-BUTTER Meaning of MIDSHIPMAN'S-BUTTER in English (ˈ) ̷ ̷| ̷ ̷ ̷ ̷ˈ ̷ ̷ ̷ ̷ noun( plural midshipman's-butters ) : avocado Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012