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say it: i-LIPS
ellipse is a noun meaning "a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it". It is pronounced /ɪˈlɪps/ — i-LIPS. It carries one recorded sense.
a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it
“the sums of the distances from the foci to any point on an ellipse is constant”
Forms marked are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for ellipse come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.