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One of a pair in an ellipse
Answer for the clue "One of a pair in an ellipse ", 8 letters:
semiaxis
Word definitions for semiaxis in dictionaries
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Semiaxis \Sem`i*ax"is\, n. (Geom.) One half of the axis of an ?llipse or other figure.
Wiktionary
Word definitions in Wiktionary
n. (context mathematics English) A line segment, joining the centre of a figure to an edge, that forms half of an axis of symmetry