[1675–85; undersea + -s1]This word is first recorded in the period 1675–85. Other words that entered Englishat around the same time include: constitutional, denature, eclectic, mouthpiece, muscular-s is a native English suffix used in the formation of adverbs. Other words that usethe affix -s include: always, betimes, needs, unawares
Examples of 'underseas' in a sentence
underseas
Brunner had contracted with an Italian firm to build the units, their intended use being ` underseas marine mammal tracking".