As a noun tel is
(automotive|aviation|organic chemistry) tetraethyllead (or tetraethyl lead, tetra-ethyl lead); a gasoline additive to boost octane rating.
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Not English
Wikidiffcom has no English definition. It may be misspelled. tel
English
Etymology 1
(en)
Noun
(
en noun)
telegraph
telegram
telephone
Etymology 2
From (etyl) .
Noun
(
en noun)
A hill or mound. (Used especially for land features in the Middle East and North Africa)