small. woody branch. stem. or shoot.

Merriam-Webster Online Dictionary
twig (noun)
1.
a small shoot or branch usually without its leaves
2.
a minute branch of a nerve or artery
twig (verb)
transitive verb
1.
- notice observe
2.
intransitive verb
to understand the meaning of - comprehend to gain a grasp - understand twigged instinctively about things H. E. Bates
twig (noun)
British - fashion style
twig (Wikipedia)

A twig is a thin branch of a tree or bush.

Twigs covered in powdered snow

The buds on the twig are an important diagnostic characteristic, as are the abscission scars where the leaves have fallen away. The color, texture, and patterning of the twig bark are also important, in addition to the thickness and nature of any pith of the twig.

There are two types of twig, vegetative twigs and fruiting spurs. Fruiting spurs are specialized twigs that generally branch off the sides of branches and are stubby and slow-growing, with many annular ring markings from seasons past. The age and rate of growth of a twig can be determined by counting the winter terminal bud scale scars, or annular ring marking, down the length of the twig. Also birds like twigs because they can sit on them.

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