STRONGS G540:
													
												
									    		ἀπάτωρ, 
-ορος, 
ὁ, 
ἡ, (
πατήρ), a word which has almost the same variety of senses as 
ἀμήτωρ, which see; [from Sophocles down]; [
without father i. e.] whose father is not recorded in the genealogies: 
Hebrews 7:3. 
    THAYER’S GREEK LEXICON, Electronic Database.
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