Synonym of lower back

plural of low back

(phonology) The cot-caught merger.

Used other than figuratively or idiomatically: see low-background, steel. / Steel with low inherent radiation levels, suitable for instruments and experiments highly sensitive to radiation.

Used other than figuratively or idiomatically: see low-background, lead. / Lead with low inherent radiation levels, suitable for instruments and experiments highly sensitive to radiation.

Pertaining to having a significantly lower level of inherent, background radiation than usual.