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- medial moraine
- median filter
- median fin
- median lethal dose
- median suture
- median vein
- Medicus, Friedrich Casimir (Medikus, Friedrich Kasimir)
- medieval woodland
- medieval woodland
- Medina, Pedro De
- mediocris
- mediocris
- Mediterranean chameleon
- Mediterranean faunal subregion
- Mediterranean faunal subregion
- Mediterranean-type margin
- medullary sheath
- medullated nerve fibre
- Medusina mawsoni
- Medusinites