We don't have synonyms for defis yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are defix, deis and defies.
(n) :
(finance, cryptocurrencies) Initialism of decentralized finance. [An experimental form of finance that does not rely on central financial intermediaries, but instead uses smart contracts on blockchains.]
(n) :
(finance, cryptocurrencies) Initialism of decentralized finance. [An experimental form of finance that does not rely on central financial intermediaries, but instead uses smart contracts on blockchains.]