tome – том, см. «thief»

tome (n.) (одинокий том в многотомном сочинении); из среднефранцузского «tome»; из латинского «tomus» - часть книги, книга; из греческого «τεμώ» - том, часть книги, дословно – отрубленный кусок; из «τίμνω» - разрубать; из PIE *tem- рубить
1510s, "a single volume of a multi-volume work," from Middle French tome (16c.), from Latin tomus "section of a book, tome," from Greek tomos "volume, section of a book," originally "a section, piece cut off," from temnein "to cut," from PIE *tem- "to cut" (source also of second element in Latin aestimare "to value, appraise," Old Church Slavonic tina "to cleave, split," Middle Irish tamnaim "I cut off," Welsh tam "morsel"). Sense of "a large book" is attested from 1570s.

В основе – тну, тинаю, т.е. секу, рублю, от «тыкаю»