lansung 1 noun English. A very large (up to 5 m. diam) forest hardwood, one of the hardest known to the Subanen. Example sentence: Subanen. Sug lansung ditug binaalu, kali'u sia penega'ay, misibang laak sug wasayu. English. As for that lansung tree there in my field, when I tried to fell it, my axe just chipped. Generic. ayu