O·ra n. A money of account among the Anglo-Saxons, valued, in the Domesday Book, at twenty pence sterling.
Os, n.; pl. Ora A mouth; an opening; an entrance.
n 1: a mouth or mouthlike opening
2: a hard brittle blue-gray or blue-black metallic element that
is one of the platinum metals; the heaviest metal known
[syn: osmium, atomic number 76]
3: (computer science) software that controls the execution of
computer programs and may provide various services [syn: operating
4: the left eye [syn: oculus sinister]
5: rigid connective tissue that makes up the skeleton of
vertebrates [syn: bone]
[also: ossa (pl), osar (pl), ora (pl)]