μάρτυρές [1 verse](noun pl masc nom) "Witness" is martus, which means "witness," and martyr." - -"Witness" is   the source of our word 'martyr', which means "witness." Jesus used this form only here, but he use the female form in a numer of other verses.

μαρτυρεῖτε [16 verses](verb 2nd pl pres ind act) "Ye be a witness" is martyreo, which means "to bear witness," "to give evidence," "give a good report," "testify to," and "acknowledge the value of." It is the basis for our word "martyr." -- "Witness" is the Greek verb that means "to give testimony" and "to bear witness." It has the sense of being true testimony. It is the verb form of the Greek word for "testimony" and "proof," which is the source of our word "martyr."

μαρτυρίαν [6 verses](noun sg fem acc ) "Witness" is from martyria, which means "testimony," and "evidence." - "Witness" is from a Greek word that means "testimony" and "evidence."

μαρτύριον [8 verses](noun sg neut acc) "Testimony" "Testimony" is martyrion, which means "testimony," and proof." -- "Testimony" is the Greek word "testimony" or "proof." From the word martys, source of our word 'martyr', which means "witness."

μαρτύρων [5 verses](noun pl masc gen) "Witnesses" is martys, which means "witness" or "witnesses" and later came to mean "martyr."  - "Witnesses" is from the Greek word that means "witness" or "witnesses" and later came to mean "martyr." It is the noun form of the verb that means "to testify" or "bear witness."