Orgasm
late 17th century: from French orgasme, or from modern Latin orgasmus, from Greek orgasmos, from organ ‘swell or be excited’.
wiktionary
From French orgasme or New Latin orgasmus, from Ancient Greek ὀργασμός(orgasmós, “excitement, swelling”), from ὀργάω(orgáō, “to swell with moisture”).
etymonline
orgasm (n.)
1680s, "sexual climax, the acme of venereal excitement," from French orgasme or Modern Latin orgasmus, from Greek orgasmos "excitement, swelling," from organ "be in heat, become ripe for," literally "to swell, be excited," related to orge "impulse, excitement, anger," from PIE root *wrog- "to burgeon, swell with strength" (source also of Sanskrit urja "a nourishment, sap, vigor," Old Irish ferc, ferg "anger"). Also used 17c. of other violent excitements of emotion or other bodily functions; broader sense of "immoderate excitement or action" is from 1763.
orgasm (v.)
1973, originally and usually in reference to a woman's sexual climax, from orgasm (n.). Related: Orgasmed; orgasming.