9 : Idioms & Phrases
Index
9-11
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noun the day in 2001 when Arab suicide bombers hijacked United States airliners and used them as bombs
9/11; Sept. 11; September 11; Sep 11.
WordNet
9-membered
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adjective satellite of a chemical compound having a ring with nine members
nine-membered.
WordNet
atomic number 9
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noun a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite
fluorine; F.