3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Mammalia  \Mam*ma"li*a\,  n.  pl  [NL.,  from  L.  mammalis.  See 
  {Mammal}.]  (Zo["o]l.) 
  The  highest  class  of  Vertebrata.  The  young  are  nourished  for 
  a  time  by  milk,  or  an  analogous  fluid,  secreted  by  the 
  mammary  glands  of  the  mother. 
 
  Note:  Mammalia  are  divided  into  three  subclasses;  --  I. 
  {Placentalia}.  This  subclass  embraces  all  the  higher 
  orders  including  man.  In  these  the  fetus  is  attached 
  to  the  uterus  by  a  placenta.  II  {Marsupialia}.  In 
  these  no  placenta  is  formed,  and  the  young,  which  are 
  born  at  an  early  state  of  development,  are  carried  for 
  a  time  attached  to  the  teats,  and  usually  protected  by 
  a  marsupial  pouch.  The  opossum,  kangaroo,  wombat,  and 
  koala  are  examples.  III.  {Monotremata}.  In  this  group 
  which  includes  the  genera  {Echidna}  and 
  {Ornithorhynchus},  the  female  lays  large  eggs 
  resembling  those  of  a  bird  or  lizard,  and  the  young, 
  which  are  hatched  like  those  of  birds,  are  nourished  by 
  a  watery  secretion  from  the  imperfectly  developed 
  mamm[ae]. 
 
  From  WordNet  r  1.6  [wn]: 
 
  Mammalia 
  n  :  warm-blooded  vertebrates  characterized  by  mammary  glands  in 
  the  female  [syn:  {Mammalia},  {class  Mammalia}] 
 
  From  THE  DEVIL'S  DICTIONARY  ((C)1911  Released  April  15  1993)  [devils]: 
 
  MAMMALIA,  n.pl.  A  family  of  vertebrate  animals  whose  females  in  a 
  state  of  nature  suckle  their  young,  but  when  civilized  and  enlightened 
  put  them  out  to  nurse,  or  use  the  bottle. 
 
 

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