From Wiktionary, the free dictionary
From ab- (“absolute”) + henry.
(US) IPA(key): /æbˈhɛn.ɹi/
abhenry (plural abhenries or abhenrys)
- (dated, physics) A unit of inductance equal to one billionth (1 x 10-9) of a henry, used in the centimeter-gram-second system of units.