porphyroxine
/ˌpɔːfɪˈrɒksiːn/(also porphyroxin) Chemistry
noun
A pentacyclic phenolic alkaloid, C20H21NO6, originally derived in an impure state from opium and present in various species of poppy.
Origin
Mid 19th century; earliest use found in Robert Thomson (1810–1864), medical officer of health. From German Porphyroxin from ancient Greek πορϕύρα purple + oxy- + -in; so called because it gives a red colour when heated with dilute mineral acid.
- keep someone dangling
- keep someone down
- keep someone guessing
- keep someone in
- keep someone in countenance
- keep someone in his (or her) place
- keep someone off
- keep someone posted
- keep someone sweet
- keep someone/thing off
- keep someone/thing on
- keep someone under
- keep someone up
- keep something back
- keep something dark
- keep something down
- keep something from
- keep something in
- keep something quiet (or keep quiet about something)
- keep something to oneself
- keep something under one's hat
- keep something up
- keep step
- keep tabs (or a tab) on
- keep the ball rolling