ultradense
adjective
ul·tra·dense
ˌəl-trə-ˈden(t)s
: very compact or crowded : extremely or extraordinarily dense
especially, chemistry
: having an extremely high mass (see mass entry 2 sense 1c) per unit volume (see volume entry 1 sense 2)
ultradense stars
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Merriam-Webster unabridged
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