List: out-dated or obsolete kana usage

obsolete reading  noun  noun (generic) 

• Japanese bigleaf magnolia (Magnolia obovata)

gikun or jukujikun  obsolete reading  noun  noun (generic) 

• swim bladder, air bladder

obsolete reading  noun  noun (generic) 

• spleen

obsolete reading  search-only kanji form  prefix 

• extreme, ultra, mega, totally, very much, precisely, exactly
• damn, stupid, cursed

obsolete reading  noun  noun (generic) 

• duo (ancient Chinese bell with a clapper and a long handle)
• large wind bell

obsolete reading  usually written using kana alone  noun  noun (generic) 

• merganser (any duck of genus Mergus)

obsolete reading  search-only kanji form  noun  noun (generic) 

• young sweetfish

obsolete reading  noun  noun (generic) 

• rule, (ruled) line
• line (on a go board, shogi board, etc.)

obsolete reading  usually written using kana alone  godan verb  godan verb (archaic)  verb (generic)  transitive verb 

• to dig out, to gouge out, to hollow out
• to scoop, to ladle, to bail
• to jerk (one's chin)

obsolete reading  noun  noun (generic) 

• carving, engraving
• chiselled features