What does "fountain pen" mean?

A pen containing a reservoir of ink, which is fed to a writing nib automatically.

Fountain pen

noun

noun ·Rare ·Advanced level

Noun

1
A pen containing a reservoir of ink, which is fed to a writing nib automatically.
"He loves using fountain pens for school work."
2
a pen that is supplied with ink from a reservoir in its barrel wordnet

"He loves using fountain pens for school work."