labrum

From Latin labrum (“lip”).

labrum (plural labrums or labra)

1. (entomology) 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. (anatomy) Any of several lip-like projections.
3. A large basin of warm water, with an overhanging lip, in a Roman bath.

• labral

• “labrum”, in OneLook Dictionary Search.
• William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “labrum”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC.

• brumal, lumbar, umbral

From Proto-Indo-European *leb- (“to hang down”). Cognate to labium and to English lip.^[1]

• (Classical Latin) IPA^(key): [ˈɫa.brũː]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈlaː.brum]

labrum n (genitive labrī); second declension

1. lip

   Synonym: labium

2. (by extension) edge, margin, brim, lip

Second-declension noun (neuter).

• (lip): labia/labea/labium

• labellum
• labrōsus

Contraction from lavābrum (“bathing tub”), from lavō (“to wash, bathe”) +‎ -brum.

• (Classical Latin) IPA^(key): [ˈɫaː.brũː]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈlaː.brum]

lābrum n (genitive lābrī); second declension

2. A bathing tub, bathtub, basin, bowl
3. A bath, bathing place.

Second-declension noun (neuter).

• (bathing place): lavācrum, lavātiō

• lābellum

• “labrum”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “labrum”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• "labrum", in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• labrum in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• Carl Meißner, Henry William Auden (1894) Latin Phrase-Book‎^[1], London: Macmillan and Co.
  • to have a superficial knowledge, a smattering of literature, of the sciences: primis (ut dicitur) or primoribus labris gustare or attingere litteras
    
• “labrum”, in Harry Thurston Peck, editor (1898), Harper’s Dictionary of Classical Antiquities, New York: Harper & Brothers
• “labrum”, in William Smith et al., editor (1890), A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin