疁

It names fire-cleared, channel-irrigated farming. Farmers burn vegetation before sowing; channels water fields. 火耕水耨 names a broader burn-and-water practice.

A Han-era law quotation in the Shuowen, an early Chinese character dictionary, is the earliest record of 疁; it dates the term, not the character's creation.

Tang-era records place 疁城乡 in Jiading; later, 疁城 named Jiading, Shanghai. It is also recorded as a surname.

What does 疁 mean when someone sends it?

Read it with its surroundings. Alone, 疁 gives little clue to tone; in a word or place-name, the surrounding characters carry the context.