naphthacene
31rubrene — ˈrüˌbrēn noun ( s) Etymology: International Scientific Vocabulary rubr (from Latin rubr , ruber red) + ene : an orange red fluorescent crystalline polycyclic hydrocarbon C42H28 that is decolorized by oxygen with the reversible formation of a… …
32tetracene — ˈte.trəˌsēn noun ( s) Etymology: alteration of tetrazene : a yellow solid compound (H3N2C)NHNHN . N(CN2H2)NHNO made by reaction of amino guanidine and nitrous acid and used as an explosive in priming compositions for cartridges and in combination …
33tetrazene — ˈte.trəˌzēn noun ( s) Etymology: International Scientific Vocabulary tetraz + ene 1. : either of two hypothetical isomeric hydrides of nitrogen HN . NNHNH2 or H2NN . NNH2 known in the form of organic derivatives (as tetracene) 2. : tetracene * *… …
34WEIZMANN, CHAIM — (1874–1952), first president of the State of Israel, president of the (World) Zionist Organization (1920–31 and 1935–46), and distinguished scientist. He was born on Nov. 27, 1874 (8 Kislev 5635), in the village of Motol near Pinsk, in the… …
