Term: ion engine: a type of reaction-propulsion engine to propel rockets in space; a stream of positive ions is accelerated to a high velocity by an electric field
Candidate hypernym: reaction-propulsion engine: a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream → 1
Candidate hypernym: left: location near or direction toward the left side; i.e. the side to the north when a person or object faces east → 0
Candidate hypernym: pyrausta: moths whose larvae are corn borers → 0
Candidate hypernym: riddle: a difficult problem → 0
Candidate hypernym: aggravation: unfriendly behavior that causes anger or resentment → 0
Candidate hypernym: coefficient of friction: the ratio of the weight of an object being moved along a surface and the force that maintains contact between the object and the surface → 0
Candidate hypernym: heavy spar: a white or colorless mineral (BaSO4); the main source of barium → 0
Candidate hypernym: skylight: a window in a roof to admit daylight → 0
Candidate hypernym: encumbrance: a charge against property (as a lien or mortgage) → 0
Candidate hypernym: jocosity: fun characterized by humor → 0
Candidate hypernym: potato fern: small epiphytic fern of South America with tuberous swellings along rhizomes → 0