Definition of "steele"

Adieu! faint-hearted instrument of lust; / That falselie hath betrayde our equale trust. / Hence-forth no more will I implore thine ayde, / Or thee, or man of cowardize upbrayde. / My little dilldo shall suply their kinde: / A knaue, that moues as light as leaues by winde; / That bendeth not, nor fouldeth anie deale, / But stands as stiff as he were made of steele; / And playes at peacock twixt my leggs right blythe, / And doeth my tickling swage with manie a sighe. / For, by saint Runnion! he'le refresh me well; / And neuer make my tender bellie swell.

1592/3, Thomas Nashe, The Choise of Valentines‎ (Poetry), published 1899, archived from the original on February 27, 2006‎

The purest part thereof [of iron ore] which in Latine is called Nucleus ferri, i. the kernell or heart of the yron (and it is that which we call steele)

1601, Pliny, translated by P. Holland, Hist. World, II xxxiv xiv 514

Shall yron breake the Northren yron, and the steele?(The Hebrew word is נחשת meaning copper. "Bow of steele" occurs in three places translating קשת נחושה.)

1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], Jeremiah 15:12

...Like a man of Steele.

c. 1606–1607, William Shakespeare, “The Tragedie of Anthonie and Cleopatra”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act IV, scene iv], line 33