sub·spe·cial·ize | \ˌsəb-ˈspe-shə-ˌlīz \
variants: or less commonly sub-specialize
subspecialized or sub-specialized; subspecializing also sub-specializing

Definition of subspecialize 

intransitive verb

: to concentrate one's efforts in a special occupation, practice, or field of study that is part of a broader specialty : to practice or study within a subspecialty Like most surgical specialists, neurosurgeons subspecialize in different areas, such as tumors, cerebrovascular, seizure, pituitary gland and pain surgery.— John Pekkanen

Other Words from subspecialize

subspecialization \ˌsəb-ˌspe-sh(ə-)lə-ˈzā-shən \ or less commonly sub-specialization noun plural subspecializations also sub-specializations
subspecializations such as creative writing, linguistics, the teaching of English, and English as a second language … — Gerald Graff surgical subspecialization

First Known Use of subspecialize

1900, in the meaning defined above

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The first known use of subspecialize was in 1900

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