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o.o.
O.O.D.
O’Odham
O-ring
O/S
o.s.
OA
oaf
oafish
oak
oak apple
oak fern
oak gall
oak leaf cluster
oak wilt
oaken
oakmoss
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O (1)
O [ ō ] (plural O's or Os)


noun 
Definition:
 
1. 'O'-shaped object: something shaped like a letter 'O'
2. zero: the number zero
3. medicine human blood type: a human blood type of the ABO system containing the O antigen. Somebody with this type of blood can donate to all other types in the group but can receive only type O blood.
Encarta® World English Dictionary [World English Edition] © & (P)2008 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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