subspecialist
noun
sub·spe·cial·ist
ˌsəb-ˈspe-sh(ə-)list
variants
or less commonly sub-specialist
plural subspecialists also sub-specialists
: a person who specializes in an occupation, practice, or field of study that is part of a broader specialty : an expert in or student of a subspecialty
Subspecialists who routinely treat patients with diseases of the external eye and the cornea …—Stephanie Bernardo Johns
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Merriam-Webster unabridged
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