What does basilar mean?
Basilar is an adjective meaning relating to, situated at, or forming the base of a structure, most commonly encountered in medicine and biology. Its best-known uses are anatomical: the basilar artery, which runs along the underside of the brain and supplies the brainstem, and the basilar membrane, a key structure in the inner ear that enables hearing by vibrating in response to sound frequencies. The word also appears in phrases such as 'basilar skull fracture,' describing a break at the base of the skull. In phonetics, basilar can describe sounds articulated with the back of the tongue. Derived from Latin basis, meaning foundation or pedestal, the term is closely related to 'basal,' though the two are not interchangeable — 'basilar' tends to name specific, well-defined structures, while 'basal' applies more generally to anything at or near a base. Because of its precision, basilar remains indispensable vocabulary for clinicians, audiologists, and anatomists, even though ordinary readers will rarely need it outside a medical context.
adjectiveRelating to, situated at, or forming the base of an organ or structure, especially the base of the skull. In linguistics, it describes consonant sounds produced with the back of the tongue against the base of the mouth.
- Anatomy: relating to or located at the base of an organ or structure, especially the base of the skull (e.g. the basilar artery runs along the base of the brain).
- Linguistics and phonetics: describing speech sounds produced with the base or back of the tongue near the base of the oral cavity.
"The MRI revealed a small aneurysm in the basilar artery at the base of the brain."
"Damage to the basilar artery can affect vision, balance, and consciousness because it supplies the brainstem."
"In the cochlea, the basilar membrane vibrates at different points depending on the frequency of the incoming sound."
The basilar artery is only about as wide as a pencil lead, yet it supplies blood to the entire brainstem — the part of you that keeps breathing and your heart beating without any effort on your part.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of basilar
Basilar derives from the Latin noun basis, itself borrowed from Greek basis, meaning 'a stepping, a foundation, a pedestal.' The adjective was formed with the Latin suffix -aris, yielding a form that entered English medical and scientific usage, likely during the early modern period when anatomical terminology was being systematized. It shares this root with words such as basal, base, basement, and basis, all pointing back to the same Greek notion of a foundation upon which something rests.
How basilar is actually used
Basilar is a technical term found almost exclusively in medical, anatomical, audiological, and linguistic writing; it is rare in everyday conversation. It carries no emotional connotation — it is purely descriptive. Writers should reserve it for established anatomical names (basilar artery, basilar membrane, basilar skull fracture) rather than using it loosely where 'basal' would be more appropriate.
Easily confused with basilar
Both mean 'relating to a base,' but 'basal' is the general term used across biology and medicine, while 'basilar' is typically reserved for specific anatomical structures such as the basilar artery or basilar membrane.
A basilica is a large, important church or ancient Roman hall of justice, whereas 'basilar' is an adjective describing something situated at the base of a structure.