Body Space or Junction
frontal sinus Audio
fron·tal si·nus [ frun-tul sy-nus ]
Subclass of:
Nasal sinus
Definitions related to frontal sinus:
  • A type of paranasal sinus (a hollow space in the bones around the nose). There are two, large frontal sinuses in the frontal bone, which forms the lower part of the forehead and reaches over the eye sockets and eyebrows. The frontal sinuses are lined with cells that make mucus to keep the nose from drying out.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • One of the paired, but seldom symmetrical, air spaces located between the inner and outer compact layers of the FRONTAL BONE in the forehead.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • The paired, mucosal lined air spaces located above the orbit and communicating with the nasal passages.
    NCI
    U.S. National Cancer Institute, 2021
Try this search on: Farlex, Merriam-Webster, Oxford Dictionary, or Wordnik

This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.