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

Derived forms: screw logs

Type of: log

• illegitimately
• illiberal
• illiberality
• illiberally
• illicit
• illicitly
• illicitness
• Illicium
• Illicium anisatum
• Illicium floridanum
• Illicium verum
• Illimani
• illimitable
• illimited
• Illinois
• Illinois River
• Illinoisan
• illiquid
• illiteracy
• illiterate
• illiterate person
• illness
• illocution
• illogic
• illogical