Question about this title: 英雄伝説 閃の軌跡 (Trails of Cold Steel)

Hi –

Just a question regarding a game I'm playing called 英雄伝説 閃の軌跡, or the Legend of Heroes, Trails of Cold Steel 1.

I was trying to figure out the meaning of 閃. Apparently it is a Kanji Kentei Pre-Level 1 Kanji that means "flash, or brandish". I am guessing that this may be why the English title was chosen as "Cold steel".

My question is that I wanted to find the meaning of the word 閃 (not the Kanji) but I looked in a couple of dictionaries I own, like the official Kanken dictionary, the Sanseidou and the Daijirin but I can't find an entry of just the Kanji by itself, however there are several compounds.

I am wondering if it has an entry or if it is some classical Japanese, or if Japanese, because of its Chinese roots, will use singular Kanji as names or nouns that would not stand alone in modern Japanese.

Also, I am wondering if I need a special dictionary. There are a quite a few electronic dictionaries for sale in the Dictionaries iOS app, if there's a particular one that's good, maybe I should buy it since I only have children's dictionaries and medium sized dictionaries.