Seussical

Short definition from Wiktionary

Proper noun

1. 1
   A musical comedy inspired from the life and bibliography of Dr. Seuss (Theodor Seuss Geisel, 1904–1991), co-written and composed by Lynn Ahrens and Stephen Flaherty.

Adjective

1. 1
   Of or relating to Dr. Seuss (Theodor Seuss Geisel, 1904–1991), American writer and cartoonist best known for his imaginative children's books, often written in rhyme.