Definition

Noun 1. The frontal bone: The large, single cranial bone that forms the forehead and the upper, anterior (front) part of the skull's vault. It also contributes to the formation of the upper parts of the eye sockets (orbits) and the nasal cavity.

Usage Notes

• This is a highly specific anatomical term. It is primarily used in formal, academic, medical, and scientific contexts such as anatomy, osteology, forensic science, and medicine (e.g., surgery, radiology).
• In common, non-specialist language, this structure is almost always referred to as "the forehead bone" or simply "the frontal bone."
• The term is derived from Latin, where "os" means "bone" and "frontale" pertains to the front. This Latin nomenclature is standard in international anatomical terminology.

Examples

• Anatomy Text: "The os frontale articulates with the two parietal bones posteriorly and the sphenoid bone inferiorly."
• Medical Report: "The CT scan revealed a linear fracture of the os frontale."
• Forensic Description: "Trauma to the os frontale was consistent with a blunt force impact."

Advanced Usage

• Anatomical Landmarks: Specific parts of the have their own names, such as the (the flat, vertical portion forming the forehead), the (the bony ridge above the eye socket), and the (the smooth area between the eyebrows).

Variants and Related Words

• Frontal bone: The direct and most common English equivalent for .
• Forehead bone: A less technical, descriptive term.
• Cranial bone: A general term; the is one of several cranial bones.
• Calvaria: The skull cap; the forms the anterior part of the calvaria.

Synonyms

• Frontal bone
• Forehead bone (colloquial)

Different Meanings

The term os frontale has only one meaning in modern English: the specific cranial bone described above. The word "frontal" by itself is an adjective meaning "of or relating to the front."

Noun

1. the large cranial bone forming the front part of the cranium: includes the upper part of the orbits