The Next Generation races such as the Cardassians and the Trill played a larger role in the DS9 universe.
Two cats known to each other may chirrup or trill when playing.
She's also feminine and strong, and has had a number of relationships during her tenure in Star Fleet, notably with a trill symbiot who, in the course of their romance, is forced to switch hosts, leaving its male host for a female one.
The science officer assigned to Deep Space Nine was a Trill, a species that embraced symbiosis with another life form.
As the sparrow had its trill, sitting on the hickory before my door, so had I my chuckle or suppressed warble which he might hear out of my nest.
His fortunes, however, were not thereby seriously affected, for by this time his business capacity and organizing skill had enabled him to consolidate his position, in spite of the difficulties he had encountered not only from rival manufacturers but also from the working classes, who in 1779 displayed their antipathy to labour-saving appliances by destroying a large Trill he had erected near Chorley.