1
Roman Catholicism
: the top of the altar
especially
: the top or central slab upon which the eucharistic elements are placed
2
[New Latin, from Latin]
: the grinding surface of a tooth
astronomy
: a dim southern constellation that is visible near the south celestial pole between the constellations of Hydrus and Chamaeleon and that is held to be a representation of Table Mountain in South Africa
Table Mountain is a South African icon and the only natural site on the planet to have a constellation of stars named after it — Mensa, meaning "the table."—Asia Pulse, 14 Nov. 2011 Mensa is one of the faintest constellations in the sky, with no stars brighter than magnitude 5.0.—Carole Stott and Giles Sparrow, Starfinder, 2010
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Merriam-Webster unabridged
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