Search Result for "semimajor axis":
Wordnet 3.0

NOUN (1)

1. one-half the major axis of an ellipse; the distance from the center of an ellipse to one end; 



WordNet (r) 3.0 (2006):

semimajor axis
    n 1: one-half the major axis of an ellipse; the distance from
         the center of an ellipse to one end