Ma'anar ƙamus na "hydrogen bond" wani nau'i ne na haɗin gwiwar sinadaran da ke faruwa tsakanin hydrogen atom da electronegative atom kamar oxygen, nitrogen, ko fluorine. A cikin haɗin hydrogen, zarra na hydrogen yana haɗawa da zarra guda ɗaya, amma kuma yana sha'awar wani gajimare na lantarki na atom, yana haifar da jan hankali na electrostatic tsakanin kwayoyin biyu. Wannan nau'in haɗin kai yana da alhakin yawancin mahimman abubuwan halitta da sinadarai, ciki har da tsari da aikin sunadaran, abubuwan da ke cikin ruwa, da kwanciyar hankali na DNA.