"Etzba'" (Hebrew אצבע)-(pl. "etzba'ot") fingerbreadth; 2 to 2.4cm, or.79 to.94in (the latter being the Chazon Ish's).
Etzba'(Hebrew אצבע)-(pl. "etzba'ot") inch, litt. "finger"; the two foremost contemporary approximations of it are 2 cm and 2,5 cm (the latter being the Chazon Ish's).