taffrail log(n = noun.artifact) patent log, screw log - a cigar-shaped log with rotary fins that measure the ship's speed;
is a kind of log

harpoon log, log, log cabin, log in, log line, log off, log on, log out, log up, log z's, nurse log, patent log, saw log, screw log, taffrail, web log, yule log