(n) trial and error (wasei: try and error)
(n) triathlon
(P)
(n) triangle
(P)
(n) trijet
(n) tribalism
(n) tribology
(n) trimix
diver's gas mix of helium, oxygen, and nitrogen
(n) picket line
(n) market trial (of a product, service)
(n) outright transaction
(n) assault rifle
(n) credit line
(n) ghost writer
(n) (comp) site license
(n) line drive to the shortstop (baseball)
(n) strike zone (baseball)
(n) stromatolite
(n) time trial
(n) dirt trial
(n) tri-athlete
(n) (comp) trial version of software
"trialware"
(n) ribbon stripe
(n) long stride
(n) (comp) outline level
(n) extra inning
(n) (uk) willow ptarmigan (Lagopus lagopus)
(n) (comp) subject line
(n) shadow stripe
(n) general strike
(n) chalk stripe