seashell /ˈsiˌʃɛl/noun 3adjective 1verb 1forms 4 noun3 •The empty shell of a marine mollusk.Look closely at the pretty seashell print on these blouses. They’re actually formulated from mathematical equations! — 2020 •A very light pink colour, like that of some seashells. •The animal living inside a seashell.The seashells on the beach are toxic and best avoided. adjective1 •Of a very light pink colour, like that of some seashells. verb1 •To collect seashells. formsseashelled · sea shelling · seashelling · seashells