(astronomy) A multiple star in the constellation of Orion; Delta (δ) Orionis. It is one of the three stars that form Orion's Belt.

So tightly made that water cannot enter or escape. / (figuratively) So devised or planned as to be impossible to defeat, evade or nullify.

(sports, billiards, snooker, pool) In the area behind the baulk line in cue sports.

Not melancholy.