(n.) An ancient galley or vessel with tree banks, or tiers, of oars.

Easy Street affluence bed of roses comfort contentment deuce-ace ease easy circumstances felicity fleshpots gracious life gracious living happiness lap of luxury leash life of ease loaves and fishes luxury prosperity prosperousness security set of three shamrock solid comfort success tercet ternary ternion terzetto the affluent life the good life three threesome thriving condition tierce trefoil trey triad trialogue triangle tricorn trident triennium trihedron trilogy trimester trine trinity trinomial trio triphthong triple crown triple threat triplet triplopy tripod triptych trireme triseme triskelion trisul triumvirate triunity trivet troika upward mobility velvet weal wealth welfare well-being