• (n.) Any elevated object on land which serves as a guide to mariners; a beacon; a landmark visible from the sea, as a hill, a tree, a steeple, or the like. Found on http://thinkexist.com/dictionary/meaning/seamark/
Sea'mark` noun Any elevated object on land which serves as a guide to mariners; a beacon; a landmark visible from the sea, as a hill, a tree, a steeple, or the like. Shak. Found on http://www.encyclo.co.uk/webster/S/49