as we were on a “fluvial and aqueous theme″ galena h. refers me to black’s on stillcidium (stilla + cadere?) for a “slow water word” in keeping with my current profession, but i respectfully submit that we could have gone to our own historical-literary roots instead to encounter this word:

see lucretius: ‘stilicidi casus lapidem cava’ (from de rerum natura I.313)

also a very proper and chinese sentiment： 水滴石穿 （出自《汉书·枚乘传》：“泰山之霤穿石，单极之绠断干。水非石之钻，索非木之锯，渐靡使之然也。”）