[1] Likewise or similarly in other lexica. The headword is aorist indicative active of laka/w, third person singular. It must be quoted from somewhere -- almost certainly (given the amount of patristic comment on the passage) the New Testament: Acts 1.18, on the gruesome death of Judas (prhnh\s geno/menos e)la/khsen me/sos).
[2] A verb other than the headword seems needed here. Adler reports that mss FV read e)la/kise (from laki/zw: cf. lambda 56, lambda 57), as does ps.-Zonaras. This is the variant of the headword used by John Chrysostom and others.
[3] This verb (for which cf. very generally lambda 60) is attested only here.