Word: horseproof
Part of speech: Adjective
Syllables: horse
proof
Definition: Resistant to horses; preventing a horse from escaping.
Morphemes:
Affix: horse
Language: en
PoS: Verb
Meaning: To get on horseback.
Affix: -proof
Language: en
PoS: Suffix
Meaning: Used to form adjectives denoting an impervious or impenetrable quality.