Lacerum or lacer from Latin may refer to:
In anatomy and medicine:
- Foramen lacerum, a triangular hole in the base of the skull
- Lacerum segment, a part of the course of the internal carotid artery
In biology:
- Animals:
- Lepton lacerum, a species of saltwater clam in the family Lasaeidae
- Plants:
- Trichocentrum lacerum, a species of orchid found from Central America to Colombia
- Moxostoma lacerum or Harlip sucker, an extinct species of ray-finned fish in the family Catostomidae
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