Archeology has recently revealed this word in the oldest example of written Hebrew, dating from 10th Century BCE, at the time of King David. Read the whole article here.
Of course, at that date, the Paleo-Hebrew, was written based on Phonecian pictograph/letters. Portions of the Dead Sea Scrolls contain this script as well.
When Ezra revived Israel after the Babylonian conquest, the Aramaic letters, which we still use today for Hebrew. (The ancient script is still used in religious texts of the Samaritans, who believe Ezra's revival mixed too much with Babylonian culture.
1 Kings 17 recalls the story of how Eliyahu was helped by the
widow of Zarephath צָרְפַתָה
אַלְמָנָה is a word unique to Hebrew, and helped identify the pottery shard which I mentioned above.
Another scholarly article for true talmidim is found here. This covers some of the most recent excavations of Eilat Mazar.
Happy studies! Keren