Compound ofslag +‎pen.

• IPA^(key):/ˈslɑx.pɛn/

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• Hyphenation:slag‧pen

slagpen f (pluralslagpennen,diminutiveslagpennetje n)

1. (ornithology) aflight feather, usually aremex, but sometimes arectrix
2. astrikingpin in amechanism