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optical character reader
optical character recognition
optical computer
optical disk
optical double star
optical fiber
optical glass
optical illusion
optical isomerism
optical mouse
optical rotation
optical scanner
optical semiconductor
optical sound
optical tweezers
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Also available:
World English Dictionary
Dictionnaire Français
optional
op·tion·al
[
ópshən'l,
ópshnəl
]
adjective
Definition:
not compulsory:
left to individual choice
It comes with optional air conditioning.
op·tion·al·ly
adverb
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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© 2009 Microsoft
It comes with optional air conditioning.op·tion·al·ly adverb
