
Overstory is the larger, taller trees of growth which occupies a forest area and shades young trees, hardwoods, brush, and other deciduous varieties which are growing beneath the larger trees (i.e., understory). ... (09 Oct 1997) ...
Found on
http://www.encyclo.co.uk/local/20973

Trees that provide the uppermost layer of foliage in a forest with more that one roughly horizontal layer of foliage.
Found on
http://www.encyclo.co.uk/local/21804

Trees composing the canopy layer of a forest; the highest trees.
Found on
http://www.neonaturalist.com/nature/nature_glossary.html

The forest canopy layer above the shrubs, herbs and small trees in a forest., Over story is also the upper level of vegetation in a two-level vegetation system (see understory)
Found on
https://sciencetrek.org/sciencetrek/topics/endangered_species/glossary.cfm

the level of forest canopy that includes the crowns of dominant, codominant, and intermediate trees.
Found on
https://www.encyclo.co.uk/local/22458

the uppermost layer of foliage in a forest, forming the canopy.
Found on
https://www.infoplease.com/dictionary/overstory
No exact match found.