IPA: /ˈɡluːər/
KK: /ɡluːər/
A person or thing that uses glue to stick things together.
The gluer carefully applied the adhesive to the paper.
Gluer → The word 'gluer' is formed from 'glue' (from Old French *glu*, meaning a sticky substance used for joining things) and '-er' (meaning a person who). A gluer is a person who applies glue or uses glue in their work.
Think of someone who uses a 'sticky substance' ('glue') to join things together, and the '-er' indicates that this person is doing the action.