Dictionary.net

• Low marshy unhealthy country by sea shore.

1919 - The concise Oxford dictionary of current English
By Sir Augustus Henry

• [It.], corr. of Maritima. A name given to a vast extent of malarious lowlands on the W. coast of Italy ; especially applied to those of Tuscany and the Papal Slates (q.v.).

1895 - Glossary of terms and phrases
By Henry Percy Smith