Amnios

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Amnios \Am"ni*os\, n.
     Same as {Amnion}.
     [1913 Webster]

From WordNet (r) 2.0 [wn]:



  amnios
       n : thin innermost membranous sac enclosing the developing
           embryo of higher vertebrates (reptiles, birds and
           mammals) [syn: {amnion}, {amniotic sac}]