ISOCLINAL Meaning of ISOCLINAL in English [ ˌʌɪsə(ʊ)'klʌɪn(ə)l ]■ adjective Geology denoting a fold in which the two limbs are parallel.OriginC19: from iso- + Gk klinein 'to lean' + -al . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004