Word: rockproof
Part of speech: Adjective
Syllables: rock
proof
Definition: Resistant to damage caused by rocks.
Morphemes:
Affix: rock
Language: en
PoS: Noun
Meaning: Any natural material with a distinctive composition of minerals.
Affix: -proof
Language: en
PoS: Suffix
Meaning: Used to form adjectives denoting an impervious or impenetrable quality.