ISLET Meaning of ISLET in English [ 'ʌɪlɪt ]■ noun1》 a small island. 2》 Anatomy a portion of tissue structurally distinct from its surroundings. Compare with island .OriginC16: from OFr., dimin. of isle (see isle ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004