Glabellar Lines
Pronunciation: glah-BEL-ar
Dynamic vertical wrinkles forming between the eyebrows, caused by repeated contraction of the corrugator supercilii and procerus muscles; a primary treatment site for neuromodulators.
Full Definition
Glabellar lines, commonly called 'frown lines' or '11 lines,' arise from habitual muscle contraction in the inter-brow region known as the glabella. They are among the most frequently documented treatment sites in cosmetic dermatology literature and regulatory product labeling. Editors should note that 'glabellar' is the adjectival form and should not be used as a standalone noun. The term appears in brand prescribing information (e.g., licensed indications for botulinum toxin products) and must be spelled correctly, as 'glabelar' (single l) is a common typographical error. In promotional copy, the colloquial '11 lines' is acceptable but should be followed by the clinical term in parentheses on first use.
Usage
Usage note: Note single 'l' in 'glabellar' is incorrect; the correct spelling uses double 'l'. Always verify in regulatory documents.