nail (the thin, horny plate at the ends of fingers and toes on humans and some other animals) / claw

slight, little

If the nail swell, [it will be] as big as finger; If the finger swell [it will be] as big as leg; If the leg swells [it will be] as big as mortar; if the mortar swell how big [it will be?] (Said in ridicule of a logician.)

whitlow

lukewarm