Term: optical crown: optical glass of low dispersion and low refractive index
Candidate hypernym: optical glass: clear homogeneous glass of known refractive index; used to make lenses → 1
Candidate hypernym: chilblain: inflammation of the hands and feet caused by exposure to cold and moisture → 0
Candidate hypernym: afterpiece: a brief dramatic piece (usually comic) presented after a play → 0
Candidate hypernym: nuclear terrorism: the use of a nuclear device by a terrorist organization to cause massive devastation or the use (or threat of use) of fissionable radioactive materials → 0
Candidate hypernym: classroom project: a school task requiring considerable effort → 0
Candidate hypernym: isometry: a one-to-one mapping of one metric space into another metric space that preserves the distances between each pair of points → 0
Candidate hypernym: sheet: bed linen consisting of a large rectangular piece of cotton or linen cloth; used in pairs → 0
Candidate hypernym: podocarpaceae: gymnosperms with simple persistent needlelike or scalelike leaves → 0
Candidate hypernym: osteostraci: extinct group of armored fish-like vertebrates; taxonomy is not clear → 0
Candidate hypernym: areolar tissue: fibrous connective tissue with the fibers arranged in a mesh or net → 0
Candidate hypernym: gemination: the doubling of a word or phrase (as for rhetorical effect) → 0