Extended Strong's Greek Lexicon (Abbott-Smith based)
to empty
Usage: κενόω, -ῶ (κενός, which see), [in LXX: Jer.14:2 15:9 (עָמָל pu.)* ;] to empty. Metaphorical, to empty, make empty, vain or of no effect: καύχημα, 1Co.9:15; ἑαυτόν, of Christ, Php.2:7 (v Lft.; ICC, in 1, and esp. Gifford, Incarn., 54 ff.); pass., πίστις, Rom.4:14; ὁ σταυρός, 1Co.1:17; καύχημα, 2Co.9:3† (AS)