A tower in Dol Amroth mentioned in the preface to the Adventures of Tom Bombadil (TR/192), glossed “Sea-ward Tower”. It is a combination of tirith “watch” and the (lenited) form of gaear “sea”, so perhaps a more literal translation would be “Sea Watch”.
place name. Sea-ward Tower
Word Gloss tirith “watching, guarding, watch, ward, guard” gaear “sea”