retainer
/ɹɪˈteɪn.ɚ/ noun C2- Any thing or person that retains.
- A dependent or follower of someone of rank.
- A paid servant, especially one who has been employed for many years.
- A fee one pays to reserve the other's time for services. · This lawyer charges a retainer for his work.
- A device that holds teeth in position after orthodontic treatment.
- A retaining valve.
Plural retainers
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