macowanites: a stout-stemmed genus of fungus belonging to the family Secotiaceae having fruiting bodies that never expand completely
abstraction: a general concept formed by extracting common features from specific examples
heliopause: the boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind from the sun and the radiation from other stars meet