• 02.040 through the tree-trunks not far ahead.
• 02.079 it was thick as a young tree-trunk –
• 06.072 and brushwood round the tree-trunks.
• 07.045 propped on wooden posts made of single tree-trunks.
• 08.003 and scuttling behind tree-trunks.
• 08.109 of the branch nearest the tree-trunk

Hyphenated in its sub-entry in OED.

“tree, n.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/205416. Accessed 21 September 2017.