Definition of "hyen"

I will laugh like a hyen.

c. 1598–1600 (date written), William Shakespeare, “As You Like It”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act IV, scene i]

Their blind feet drift in the darkness, and no one is leading;Their toil is the pasture, where hyens and harpies are feeding

1900, Edwin Markham, The Man with the Hoe, and Other Poems (poem), The Toilers