From ZooTerms (Dictionary of Invertebrate Zoology)
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labrum (noun; plural labra; Latin labrum, lip): 1. A lip or edge.

2. (Arthropoda: Chelicerata) In Araneae, has been incorrectly used for the labium.

3. (Arthropoda: Crustacea) The unpaired outgrowth arising in front of the mouth and often covering it; upper lip.

4. (Arthropoda: Insecta) The upper lip located below the clypeus and in front of the other mouth parts.

5. (Arthropoda: Trilobita) The hypostoma of a trilobite fossil.

6. (Echinodermata: Echinoidea) A flap of the interambulacrum which projects over the ventral peristome.