Alternative form of abandon hope all ye who enter here

(organic chemistry) astaxanthin / (biochemistry) Any of a group of endopeptidases containing a motif that binds zinc

A river in New Hampshire, United States.

A general guideline, rather than a strict rule; an approximate measure or means of reckoning based on experience or common knowledge. / (attributive, usually hyphenated) Approximated, guesstimated.