PALANQUIN păl’ ən ken’ (אַפִּרְיֹ֗ון). A word found only in ASV and RSV in the Song of Solomon (KJV CHARIOT). The precise meaning of the Heb. word is uncertain, but it prob. means a sedan chair.

International Standard Bible Encyclopedia (1915)

pal-an-ken’: In So 3:9 occurs ’appiryon, a word that has no Semitic cognates and is of dubious meaning. In form, however, it resembles the Sanskrit paryanka, and still more closely the Greek phoreion, both of which mean "litter bed." Hence, the Revised Version (British and American) "palanquin" (ultimately derived from paryanka). The margin "car of state" and the King James Version "chariot" are mere guesses.