yellow-flowered European plant that grows on old walls and in waste places; an adventive weed in North America
a jet engine containing its own propellant and driven by reaction propulsion
any vehicle self-propelled by a rocket engine
erect European annual often grown as a salad crop to be harvested when young and tender
an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure
anything that suggests a wall in structure or function or effect
a difficult or awkward situation
a vertical (or almost vertical) smooth rock face (as of a cave or mountain)
