Word origin
[1875–80; ‹ Gk
týlōsis act of making callous, equiv. to
tylō-, var. s. of
tyloûn to make callous, hard, deriv. of
týlos callus, lump, knob +
-sis -sis]This word is first recorded in the period 1875–80. Other words that entered Englishat around the same time include: authoritarian, cross-fertilization, graph, slime mold, weekender-sis is a suffix appearing in loanwords from Greek, where it was used to form from verbsabstract nouns of action, process, state, condition, etc. Other words that use theaffix -sis include: analysis, anamnesis, crisis, symbiosis, thesis