LATIN DICTIONARYLexicon Latīnum
proper nounthird declension

Mare tranquillitātis

Mare tranquillitātis n sg (genitive Maris tranquillitātis)

Meaning

  1. Sea of Tranquility (a basin in Nearside, Moon, Earth, Solar System)

Origins

mare + tranquillitātis. From Mare Tranquilitatis (spelled with one L). Coined by Italian Jesuit astronomer Giovanni Battista Riccioli, by labelling a map created by Italian Jesuit optician Francesco Maria Grimaldi, and then published in 1651 in the Almagestum Novum.

Quick answers

What does Mare tranquillitātis mean in Latin?
Mare tranquillitātis, a proper noun, means “Sea of Tranquility (a basin in Nearside, Moon, Earth, Solar System)”.
What is the genitive of Mare tranquillitātis?
The genitive singular is Maris tranquillitātis. Mare tranquillitātis is third declension.