Word: locknut
Part of speech: Noun
Syllables: lock
nut
Definition: A second nut, screwed down onto another in order to prevent it slipping.
Morphemes:
Affix: lock
Language: en
PoS: Noun
Meaning: A fastening together or interlacing; a closing of one thing upon another; a state of being fixed or immovable.
Affix: nut
Language: en
PoS: Noun
Meaning: A shaped piece of metal, threaded by a wire loop, which is jammed in a crack in the rockface and used to protect a climb. (Originally, machine nuts sense #2 were used for this purpose.)