(obsolete) Presiding over matter.

(organic chemistry) An angular furanocoumarin chemical compound found in angelica root, 2-(9-{[(2Z)-2-methylbut-2-enoyl]oxy}-2-oxo-2H,8H,9H-furo[2,3-H]chromen-8-yl)propan-2-yl (2Z)-2-methylbut-2-en...

(biochemistry) Of, pertaining to, or derived from lignocellulose; used especially to describe the products of biomass.

(US, originally university slang, now general slang, derogatory) Like, or characteristic of, a dweeb; nerdy, uncool.