You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
Share sea frontier
Cite this Entry
“Sea frontier.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sea%20frontier. Accessed 19 Jan. 2022.
See Definitions and Examples »
Get Word of the Day daily email!
Farm Idioms Quiz
Can you spell these 10 commonly misspelled words?
A daily challenge for crossword fanatics.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Top 10 Latin Phrases
From the week ending 1/14/2022
Here's where those fancy shades get their names.
Have we piqued your interest?
A simple trick to keep them separate
How 'literally' can mean "figuratively"
How to use a word that (literally) drives some pe...
The awkward case of 'his or her'
New Year, Recondite Vocabulary
Take the quiz
Tough words and tougher competition.