Strong's #8558: tamar (pronounced taw-mawr')
 from an unused root meaning to be erect; a palm tree:--palm (tree).
Brown-Driver-Briggs Hebrew Lexicon:
 ּ 
  tâmâr 
 
 1) palm tree, date palm
 
  Part of Speech: noun masculine
Relation: from an unused root meaning to be erect
Usage:
This word is used 11 times:
Exodus 15:27: "were twelve wells of water, and threescore and ten  palm trees: and they encamped there by"
Leviticus 23:40: "of goodly trees, branches  of palm trees, and the boughs of thick trees, and willows"
Numbers 33:9: "were twelve fountains of water, and threescore and ten  palm trees; and they pitched there."
Deuteronomy 34:3: "of the valley of Jericho, the city  of palm trees, unto Zoar."
Judges 1:16: "father-in-law, went up out of the city  of palm trees with the children of Judah"
Judges 3:13: "and possessed the city  of palm trees."
Nehemiah 8:15: "and pine branches, and myrtle branches,  and palm branches, and branches"
Psalms 92:12: "The righteous shall flourish  like the palm tree: he shall grow like a cedar in Lebanon."
Song of Solomon 7:7: "This thy stature is like  to a palm tree, and thy breasts to clusters"
Song of Solomon 7:8: "I said, I will go up  to the palm tree, I will take hold of the boughs thereof: now also thy breasts shall be"
Joel 1:12: "and the fig tree languisheth; the pomegranate tree,  the palm tree also, and the apple tree, even all the trees"