seasandEtymologyFrom Middle English se-sond, see-sand, equivalent to sea + sand.seasand means sand of the sea floor or seashore. Lexicurio rates it Sui generis — a strength score of 90 out of 100.nounSand of the sea floor or seashore.“The seasand is applied alone, or more often mixed with straw, dung, or some other natural fertiliser, usually at the rate of 10 to 15 tons per hectare, although sometimes twice the amount is used.”A sandy seabeach.