
1) Acacia melanoxylon 2) Blackwood 3) Blackwood tree
Found on
https://www.crosswordclues.com/clue/lightwood

Lightwood is a suburb of Stoke-On-Trent, Staffordshire. It is located to the south of Longton, and Lightwood Road runs from here to Rough Close. The area gives its name to The Lightwood Hoard, a substantial collection of Roman coins discovered buried in the garden of a house on Lightwood Road in 1960. Though containing mostly private housing, the ...
Found on
http://en.wikipedia.org/wiki/Lightwood

• (n.) Pine wood abounding in pitch, used for torches in the Southern United States; pine knots, dry sticks, and the like, for kindling a fire quickly or making a blaze.
Found on
http://thinkexist.com/dictionary/meaning/lightwood/
Light'wood` (-wod`)
noun Pine wood abounding in pitch, used for torches in the Southern United States; pine knots, dry sticks, and the like, for kindling a fire quickly or making a blaze.
Found on
http://www.encyclo.co.uk/webster/L/41

[
n] - tall Australian acacia yielding highly valued black timber
Found on
http://www.webdictionary.co.uk/definition.php?query=lightwood
Acacia melanoxylon noun tall Australian acacia yielding highly valued black timber
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.