Meaning

noun a concave shape whose distinguishing characteristic is that the concavity faces downward

noun informal terms for a human head

noun a stadium that has a roof

originBorrowed from Middle French dome, domme (modern French dôme), from Italian duomo, from Latin domus (ecclesiae) (literally “house (of the church)”), a calque of Ancient Greek οἶκος τῆς ἐκκλησίας (oîkos tês ekklēsías). Doublet of domus and duomo.

Etymology from Wiktionary, CC BY-SA 3.0