1. Thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
   - amniotic sac, amnios

Derived forms: amnia, amnions

See also: amniotic

Type of: sac

Part of: amniote, fetal membrane

Encyclopedia: Amnion

• lxxxviii
• Lyallpur
• Lycaena
• Lycaena hypophlaeas
• lycaenid
• lycaenid butterfly
• Lycaenidae
• Lycaeon
• lycanthrope
• lycanthropic
• lycanthropy
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• lyceum
• lych
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• lychgate
• Lychins chalcedonica
• Lychins floscuculi
• lychnis
• Lychnis alba
• Lychnis coronaria
• Lychnis dioica
• Lychnis flos-cuculi
• Lycia
• Lycian