Tubular with one end dilated, as the flower of the trumpet creeper.(adjective)
Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)
Use "trumpet-shaped" in a sentence
"But the trumpet-shaped flowers make a dramatic splash wherever they sprawl; if those flowers close during the day, it's often a sign that rain is on the way."
"It's trumpet-shaped flower is beautiful but poisonous—be careful not to map in its shade as the poison can drop into your mouth!"
"A decorative vine with rose, purple or white trumpet-shaped flowers."