(botany) Either of two rare Old World deciduous trees, Sorbus domestica or Sorbus torminalis.

The edge of the habitat at which trees are capable of growing; the timberline.

(botany) Any tree that bears apples, principally Malus domestica but also certain wild species.

Unethical actions in the service of good intentions will have immoral or unethical consequences.

someone who starts a trend, or makes one more popular

(chiefly US) a recreational structure built among the branches of a tree / a tropical residence built in a tree, or on stilts

The fluid that circulates within the phloem of a tree to distribute water and nutrients.

All the tissues of a tree external to the vascular cambium; includes epidermis, cortex and phloem.

involving or constituting treason

A foot-operated pedal or lever that generates motion. / A device actuated by wheels passing over it. / (biology) Chalaza.