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O

PRIMARY MEANINGS OF: O

1
 n
the 15th letter of the Roman alphabet
2
 n
a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust
3
 n
the blood group whose red cells carry neither the A nor B antigens
FULL DEFINITIONS OF: O
1

n the 15th letter of the Roman alphabet

Synonyms:
o
Type of:
alphabetic character, letter, letter of the alphabet
the conventional characters of the alphabet used to represent speech
2

n a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust

Synonyms:
atomic number 8, oxygen
Types:
LOX, liquid oxygen
a bluish translucent magnetic liquid obtained by compressing gaseous oxygen and then cooling it below its boiling point; used as an oxidizer in rocket propellants
Type of:
chemical element, element
any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
gas
a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely
3

n the blood group whose red cells carry neither the A nor B antigens

Synonyms:
group O, type O
Type of:
blood group, blood type
human blood cells (usually just the red blood cells) that have the same antigens
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