What does "flubber" mean?

A rubbery polymer formed by cross-linking of polyvinyl alcohol with a boron compound, used as a plaything or to demonstrate physical properties.

What is a synonym for "flubber"?

Common synonyms include: slime.

noun

noun ·Rare ·Advanced level

Noun

1
A rubbery polymer formed by cross-linking of polyvinyl alcohol with a boron compound, used as a plaything or to demonstrate physical properties. uncountable
2
One who flubs; a goof, a person who makes errors while speaking.

Etymology 1

Blend of flying + rubber; originally the name of a fictional substance in the film The Absent-Minded Professor (1961).

Etymology 2

From flub + -er.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.