Definition of "brow"

'Tis not your inky brows, your black silk hair, / Your bugle eyeballs, nor your cheek of cream / That can entame my spirits to your worship.

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 III, scene v]

And his arch'd brow, pulled o'er his eyes, / With solemn proof proclaims him wise.

c. 1763, Charles Churchill, The Ghost

Thy spirit within thee hath been so at war,And thus hath so bestirr'd thee in thy sleep,That beads of sweat have stood upon thy browLike bubbles in a late-disturb'd stream, […]

c. 1597 (date written), William Shakespeare, “The First Part of Henry the Fourth, […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act II, scene iii]

Mr. Banks’ panama hat was in one hand, while the other drew a handkerchief across his perspiring brow.

1913, Robert Barr, chapter 5, in Lord Stranleigh Abroad‎

Tending my flocks hard by i' the hilly crofts / That brow this bottom glade.

1634 October 9 (first performance), [John Milton], edited by H[enry] Lawes, A Maske Presented at Ludlow Castle, 1634: […], London: […] [Augustine Matthews] for Hvmphrey Robinson, […], published 1637; reprinted as Comus: […] (Dodd, Mead & Company’s Facsimile Reprints of Rare Books; Literature Series; no. I), New York, N.Y.: Dodd, Mead & Company, 1903, page 19, lines 531–532