also: じょうしん
noun
upper lip
Standard anatomical term for the upper lip in everyday and medical contexts.
彼女は緊張すると上唇を噛む癖がある。
She has a habit of biting her upper lip when she's nervous.
転んで上唇
I fell and cut my upper lip.
noun
labrum
Only with reading じょうしん
Zoological term for the upper lip-like structure in arthropods and other invertebrates. Read as じょうしん in this specialized sense.
昆虫の上唇は、口器の一部を形成する。
The labrum of insects forms part of the mouthparts.