~ 1 [ 'lɛptɒn ]
■ noun ( plural lepta ) a former monetary unit of Greece used only in calculations, worth one hundredth of a drachma.
Origin
from Gk ~ , neut. of leptos 'small'.
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~ 2 [ 'lɛptɒn ]
■ noun Physics a subatomic particle that does not take part in the strong interaction, such as an electron, muon, or neutrino.
Derivatives
~ic adjective
Origin
1940s: from Gk leptos 'small' + -on .