How do you say “tropic” in Vietnamese?

Vietnamese words for “tropic”

• nhiệt đớiListennoun
  Hanoi [ɲiət̚˧˨ʔ ʔɗəːj˧˦] · Saigon [ɲiək̚˨˩˨ ʔɗəːj˦˥]nhiệt heavy đới rising

  the tropics

  for “tropic” meaning: Either of the two parallels of latitude 23°26′ north and south of the equator; the farthest points at which the sun can be directly overhead; the boundaries of the torrid zone or tropics.

• chí tuyếnListennoun
  Hanoi [t͡ɕi˧˦ twiən˧˦] · Saigon [cɪj˦˥ t⁽ʷ⁾iəŋ˦˥]chí rising tuyến rising

  a tropic