Term: psilopsida: whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs
Broader: class: (biology) a taxonomic group containing one or more orders | Unrelated: reaction: extreme conservatism in political or social matters
Broader: class: (biology) a taxonomic group containing one or more orders | Unrelated: line coach: an assistant football coach in charge of the linemen
Broader: class: (biology) a taxonomic group containing one or more orders | Unrelated: horsehair: hair taken from the mane or tail of a horse
Broader: class: (biology) a taxonomic group containing one or more orders | Unrelated: sitting: a session as of a legislature or court
Broader: class: (biology) a taxonomic group containing one or more orders | Unrelated: satyr play: an ancient Greek burlesque with a chorus of satyrs
Broader: class: (biology) a taxonomic group containing one or more orders | Unrelated: welsh springer spaniel: a red-and-white breed slightly smaller than the English springer spaniel
Broader: class: (biology) a taxonomic group containing one or more orders | Unrelated: imperialism: any instance of aggressive extension of authority
Broader: class: (biology) a taxonomic group containing one or more orders | Unrelated: perpetual motion machine: a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy
Broader: class: (biology) a taxonomic group containing one or more orders | Unrelated: jazz band: a small band of jazz musicians
Broader: class: (biology) a taxonomic group containing one or more orders | Unrelated: madrigal: an unaccompanied partsong for 2 or 3 voices; follows a strict poetic form