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“It's very possible that it's from a Semitic root though of course words came into proto-Arabic after it separated from common Semitic, but whatever cognates it had have presumably vanished.”
“Nabataean, Lihyanian, or Tamudic, Minean and so-called proto-Arabic inscriptions.”
“The generic term Himyarite designates the proto-Arabic monumental inscriptions which have been discovered, especially in the past half-century, in the south of the Arabian peninsula.”
Looking for tweets for proto-Arabic.