seaside Get Printable Handwriting (sea-side) 2 syllables Rhymes Learn It! Spelling Test Definition noun. the land along the sea; seacoast;adjective. situated on or pertaining to the land along the sea. Example Sentence We like to go to the seaside in the summer. Synonyms seacoast; seashore; shore Antonyms inland Rhymes Two Syllable Rhymes (1) seaside Share with your friends: