protagon
/ˈprəʊtəɡ(ə)n/Biochemistry. Now historical
noun
A fatty substance, occurring chiefly in the white matter of the brain, consisting of a mixture of cerebrosides and sphingomyelin (originally thought to be a single substance).
Origin
Mid 19th century; earliest use found in Proceedings of the Royal Society of London. From German Protagon from ancient Greek πρωτο- + ἄγον, neuter present participle of ἄγειν to lead.
- as long as one's (or someone's) arm
- aslope
- a slow burn
- as luck would have it
- ASM
- a smack in the face (or eye)
- (as) mad as a box of frogs
- (as) mad as a gum tree full of galahs
- (as) mad as a hatter
- (as) mad as a March hare
- (as) mad as a meat axe
- a small fortune
- as many
- Asmara
- Asmera
- (as) merry (or lively) as a grig
- as much
- (as) much as
- Asn
- as near as
- as near as dammit (or damn it)
- as near as damn it
- (as) nice (or sweet) as pie
- a snowball's chance (in hell)
- (as) nutty as a fruitcake