1. A cigar-shaped log with rotary fins that measure the ship's speed
   - patent log, screw log

Derived forms: taffrail logs

Type of: log

• fireplug
• firepower
• fireproof
• firer
• fireroom
• fireside
• firestarter
• firestone
• firestorm
• firethorn
• firetrap
• firewall
• firewater
• fireweed
• firewheel tree
• firewire
• firewood
• firework
• firing
• firing chamber
• firing line
• firing mechanism
• firing off
• firing party
• firing pin