caulk

The story

1. Late Latin · derived fromcalicāre“to fill in with limestone, caulk”
2. Old Northern French · derived fromcauquer
3. English todaycaulk

From Old Northern French cauquer, from Late Latin calicāre (“to fill in with limestone, caulk”), derived from calx (“limestone, chalk”). Related to calx, cauk, chalk, and calculus.