Here are some Bonsai terms you will need to know.  This list is continued from the last post.

21. Dieback – the death of the tips of branches, or whole branches, due to extreme weather or possibly one of several diseases.
22. Divided leaf – a leaf formed of separate sections that emerge from a common base.
23. Division – a method of propagating shrubs by carefully dividing the root ball and replanting the separated sections.
24. Dormant – the period of the year when little or no growth occurs; usually late autumn and throughout the winter months.
25. Dwarf – a variety or cultivar that is smaller than the species tree, but retains all of the characteristics of a full size species tree.
26. Evergreen – a tree or shrub that retains its leaves throughout the year.
27. Fertilizer – is "food" for trees, shrubs and plants; usually comprised of NPK: Nitrogen for the foliage, Phosphorous for the roots, and Potassium for the flowers.
28. Foliage pad – a mass of foliage on a branch; sometimes referred to as a cloud.
29. Fruit – the part of a plant that carries the seeds; usually berries or fleshy or pod like.
30. Fukinagashi – a traditional Japanese bonsai style; also called windswept. This is a tree that has its trunk and branches swept back in one direction; illustrating a tree exposed to very forceful winds.
31. Genus – a unit of classification for a group of closely related plants.
32. Germination – the moment a seed starts into growth, developing roots and shoots.
33. Girth – the circumference of the trunk of a tree, measured at just above the root base.
34. Grafting – is a commonly used method for propagating trees, when propagation by seeds or cuttings is impractical or impossible.
35. Han-Kengai – a traditional Japanese bonsai style; also called semi-cascade. Where the branches and trunk of a tree are swept down to one side, but not below the top lip of the container; illustrating a tree subject to violent winds and weather.
36. Hardy – a term used to describe trees capable a withstanding winter frost.
37. Hokidachi – a traditional Japanese bonsai style; also called broom. Where the trunk is straight with symmetrical branches and has its foliage arranged in a semi-circular dome or broom shape.
38. Humidity – the amount or degree of moisture in the air.
39. Internodal distance – the length of stem between two nodes or leaf joints.
40. Ikadabuki – a traditional Japanese bonsai style; also called raft. Where the tree is laid on its side and its branches are trained vertically and arranged in a group formation.

I found these terms at Bonsai Boy of NY

Just Max

Here are some Bonsai Terms you will need to know.

1. Accent Plant – a small plant that is put on view in conjunction with a bonsai; usually when a bonsai is being formally displayed at a show or exhibition; also called a companion plant.
2. Air Layer – a method for propagating trees through the removal of a large branch or section of trunk from an existing tree, or bonsai, to create a new tree.
3. Akadama – a traditional Japanese bonsai soil that is comprised of the red volcanic matter of Japan; used for thousands of years by bonsai artists on most types of deciduous bonsai trees.
4. Apex – the very top or highest point of a bonsai tree.
5. Back budding – a process of encouraging new growth on a branch where growth is currently non-existent.
6. Broadleaved – trees, mainly deciduous, with broad, flat leaves; non-conifer trees.
7. Bunjin – a traditional Japanese bonsai style; also called literati. This is a tree that has a tall, slender trunk with foliage growing only near the top; illustrating maturity and the casting off of material things.
8. Buttress – the area of a tree trunk where the roots meet the soil surface; usually styled to convey strength.
9. Callus – the scar tissue that forms over a wound where a branch has been pruned off of a tree; it is part of the tree's healing process.
10. Cambium – the thin layer of green colored cell tissue growing between the bark and the wood of a living tree.
11. Canopy – all of the upper-most branches that form the top of a tree.
12. Chokkan – a traditional Japanese bonsai style; also called a formal upright. This is a tree that has a very straight trunk with symmetrical branching; illustrating strength and order.
13. Collected tree – finding and taking a tree from its natural habitat; a tree that has been shaped by the forces of nature alone.
14. Conifer – a tree that bears cones; mainly evergreen trees such as: pines, cedars, spruces and junipers.
15. Cross – a hybrid resulting from cross-fertilization between species or varieties.
16. Crown – the upper section of a bonsai where the branches spread out from the trunk.
17. Cultivars – cultivars are plants that have features desirable to the person "cultivating" them. These desirable characteristics have been deliberately selected and can be reliably reproduced in plants under controlled cultivation.
18. Cut-leaved – a bonsai that has leaves which are shaped in very distinct segments.
19. Deciduous – a tree that has a seasonal growth cycle where new foliage is produced in the spring, then grows throughout the summer, turns colors in autumn, and drops in the winter, leaving buds on the branches for next spring's new foliage.
20. Defoliation – the practice of removing all leaves to encourage new shoots and potentially smaller leaves.

I found these and more at Bonsai Boy of NY

Just Max