相切

xiāngqiē
(math.) to be tangential to each other

CEDICT

math

Entry Composition

1 相 xiāng
  1. each other
  2. one another
  3. mutually
  4. fret on the neck of a pipa 琵琶 pípa (a fret on the soundboard is called a 品 pǐn)
2 切 qiē
  1. to cut; to slice; to carve
  2. (math) tangential