Simple past tense and past participle of trial.(verb)
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Use "trialled" in a sentence
"The ACF issue of MOD90 has been delayed, this is because a heavy duty version is being trialled, which is designed to cope with the increased use associated with being removed from the wallet and flashed around."
"He said labels trialled by the UK Food Standard Authority warned shoppers at a single glance when a product contained an unhealthy amount of fat, saturated fat, sugar or salt"
"Officials from other countries -- including Brazil and Venezuela -- overruled efforts to get CCS included in the CDM because they regard the technology as unproven and potentially dangerous, and don't want it to be "trialled" in the developing world."