Similis in Latin is a adjective meaning Like or Similar
Similis, velut.
Non est ei similis is Latin for "He/she/it is not like him/her/it". It's impossible to know who or what is being referred to without knowing the context.
A english word that has the root word similis is similar
Similis omnibus.
Similis igni.
Comes from the word similis meaning like
Pulchritudo feminae formosae similis musicae est.
Cerithiella similis was created in 1912.
Pfitzneriella similis was created in 1954.
Hyponerita similis was created in 1909.
Trixoscelis similis was created in 1970.
Oxyporus similis was created in 1925.