Definitions

1. noun

A type of safety cap used to cover the tip of a pencil or pen to prevent ink from leaking or drying out.

“She applied a fillercap to the dry pen to revive its writing performance.”

2. noun

A protective cap or cover for the tip of a writing instrument, often used to keep the writing surface moist.

“The fillercap on the pen helped her write smoothly for several days without refilling the ink.”