neutrality: pH value of 7
ph: (from potential of Hydrogen) the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is more basic and less than 7 is more acidic)
coelogyne: any of various orchids of the genus Coelogyne with: clusters of fragrant lacy snow-white flowers; salmon-pink solitary flowers; chainlike racemes of topaz and chocolate brown flowers; spikes of delicate white spice-scented flowers; emerald green flowers marked with blue-black