Senses
函 variants: 圅 letter
(literary or formal) a letter; correspondence; official document
函 variants: 圅 case
(bound form) a small box, case, or envelope; a protective cover for books or objects
函 to contain
(bound form) to contain; to include; to wrap or enclose
函 variants: 圅 to mail
(bound form) to send by mail; to correspond by letter
函 surname
a Chinese surname
函 armor
(archaic) armor; body armor
函 tongue
(archaic) the tongue