?? - 2 letter crossword answer

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adjective - of or related to the genital and urinary organs or their functions; "genitourinary infections"
the largest and southernmost island in the Marianas which is administered as a territory of the United States; it was ceded by Spain to the United States in 1898

noun - the SI unit of energy absorbed from ionizing radiation; equal to the absorption of one joule of radiation energy by one kilogram of matter; one gray equals 100 rad

noun -
Enthalpy - (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure; "enthalpy is the amount of energy in a system capable of doing mechanical work"
Henry - a unit of inductance in which an induced electromotive force of one volt is produced when the current is varied at the rate of one ampere per second
Hydrogen - a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
Planck's Constant -,the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second

noun - (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day

noun - a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues; "fish have simpler hemoglobin than mammals"

noun - a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)
the 5th letter of the Hebrew alphabet

noun - 3 to 30 megahertz
a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons

noun - 100 grams
a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures

noun - an expression of greeting; "every morning they exchanged polite hellos"
hello
Hi (Hawaii) a state in the United States in the central Pacific

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