Term: grey birch: medium-sized birch of eastern North America having white or pale grey bark and valueless wood; occurs often as a second-growth forest tree
Broader: birch: any betulaceous tree or shrub of the genus Betula having a thin peeling bark | Unrelated: paratroops: infantry trained and equipped to parachute
Broader: birch: any betulaceous tree or shrub of the genus Betula having a thin peeling bark | Unrelated: intervertebral disc: a fibrocartilaginous disc serving as a cushion between all of the vertebrae of the spinal column (except between the first two)
Broader: birch: any betulaceous tree or shrub of the genus Betula having a thin peeling bark | Unrelated: cyclotron: an accelerator that imparts energies of several million electron-volts to rapidly moving particles
Broader: birch: any betulaceous tree or shrub of the genus Betula having a thin peeling bark | Unrelated: genus chlamydia: type genus of the family Chlamydiaceae: disease-causing parasites
Broader: birch: any betulaceous tree or shrub of the genus Betula having a thin peeling bark | Unrelated: radical: a person who has radical ideas or opinions
Broader: birch: any betulaceous tree or shrub of the genus Betula having a thin peeling bark | Unrelated: tassel hyacinth: large beautiful Mediterranean species having sterile bluish-violet flowers with fringed corollas forming a tuft above the fertile flowers
Broader: birch: any betulaceous tree or shrub of the genus Betula having a thin peeling bark | Unrelated: lobbyism: the practice of lobbying; the activities of a lobbyist
Broader: birch: any betulaceous tree or shrub of the genus Betula having a thin peeling bark | Unrelated: dualism: the doctrine that reality consists of two basic opposing elements, often taken to be mind and matter (or mind and body), or good and evil
Broader: birch: any betulaceous tree or shrub of the genus Betula having a thin peeling bark | Unrelated: fern seed: the asexual spore of ferns that resembles dust; once thought to be seeds and to make the possessor invisible
Broader: birch: any betulaceous tree or shrub of the genus Betula having a thin peeling bark | Unrelated: kicker: a player who kicks the football