Found 4 phrases starting with HY:

Skip to:H - HBHC - HEHF - HHHI - HKHL - HNHO - HQHR - HTHU - HWHXHYHZ

hydrogen ionUsed other than as an idiom: see hydrogen, ion. ; H or HRate it:
hydrogen iona proton combined with one or more water molecules; usually written H3O and called the hydronium ion though is best considered as H9O4 but is often written H(aq) for simplicityRate it:
hydrogen iona bare hydrogen nucleus; a proton , deuteron or tritonRate it:
hygiene theatreExcessive and unnecessary cleaning and disinfection of physical locations, to create and maintain an appearance that the location has proactively been made safe, notwithstanding evidence that the actions taken are unnecessary.Rate it:

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