光锥

光錐
guāngzhuī
(physics) light cone

CEDICT

physics

Entry Composition

1 光 guāng
  1. bright; shiny
  2. only; merely
  3. used up; finished
  4. to leave (a part of the body) uncovered

classifier: 道
2 锥 zhuī
  1. cone
  2. awl
  3. to bore