tofu

The story

1. Middle Chinese · derived from豆腐“curdled bean”
2. English todaytofu

Borrowed from Japanese 豆(とう)腐(ふ) (tōfu), from Middle Chinese 豆腐 (duwᴴ bju^X, “curdled bean”). Doublet of dubu and doufu.

First known use, by meaning

• from 2008 Initialism of trust on first use, a type of network software security model where a client requests an identification code from a remote host when establishing the first connection.