Ant-hēl'ion, n.

noun

(-hēl'yun), n.; pl. ANT-HĒ'L'I-A. [Gr. ἀντί, over against, and ἥλιος, sun.] (Meteor.) A luminous appearance upon a cloud, over against or opposite to the sun. It consists of a circular ring or rings around the shadow of the spectator’s own head, as projected on a cloud or on some opposite fog-bank. Nichol.