What is "labrum"

Labrum \La"brum\, n.; pl. L. Labra, E. Labrums. [L.]

1. A lip or edge, as of a basin.

2. (Zo["o]l.)

   1. An organ in insects and crustaceans covering the upper part of the mouth, and serving as an upper lip. See Illust. of Hymenoptera.

   2. The external margin of the aperture of a shell. See Univalve.

lip or lip-like part, 1816, in various anatomical and zoological uses, from Latin labrum, cognate with labium "lip" (see lip (n.)). Also noted mid-15c. as the name of some herb.

n. 1 The uppermost of the mouthparts (trophi) of a typical insect, such as a cockroach. Typically resembles an upper lip and forms part of the roof of the mouth in such insects. 2 (context anatomy English) Any of several lip-like projections. 3 A large basin of warm water, with an overhanging lip, in a Roman bath.

Labrum as a surname is either of Old English (pre 12th century) or of medieval French origin. Variants can include: Laban, Labern, Laboune, Labram, Layborn, Leban, Leeburne, or Leyban.

English names are derived from the Yorkshire and Kent villages now spelt as Leyburn or Leybourne, derived from 'Ley' or 'Le' (clearing), and 'burn' (stream). The name was originally recorded in the Pipe Rolls of Kent as Leburn.

If the family origin is French, the name may derive from Le Bon - "the good", a nickname which may be complementary or imply the opposite of the literal translation. The name could also be an adaption of the French name Lebrun, from the Old French 'brun' (brown), similar to the Old High German 'brun', with the addition of the definite article 'le'. The usage may have been a nickname for someone who had brown hair, a brown complexion, or who wore brown clothing. This name is associated with descendents of the Huguenots in the United States.

Category:Surnames

Labrum Latin, defined as "having the edge"

• Labrum London (fashion), Menswear fashion brand
• Labrum (arthropod mouthpart)
• Labrum (architecture), a large water-filled vessel or basin with an overhanging lip
• Labrum (surname), an English surname
• Acetabular labrum, a ring of cartilage that surrounds the acetabulum, the socket of the hip joint
• Glenoid labrum, a lip-like projection of cartilage on the human scapula surrounding the joint between the humerus and the shoulder blade

The labrum is a flap-like structure that lies immediately in front of the mouth in almost all extant Euarthropoda. The most conspicuous exceptions are the Pycnogonida, which probably are chelicerate-relatives. In entomology, the labrum amounts to the "upper lip" of an insect mouth, the corresponding "lower lip" being the labium.

The evolutionary origin, embryogenesis and morphological development of the labrum have proved to be by far the most controversial and challenging topic in the study of arthropod head structures.

The labrum in architecture was a large water-filled vessel or basin with an overhanging lip. Marble labrums were a common feature of Roman thermae.