Relating to protistology.

(US, politics, derogatory) pro-choice / (sometimes derogatory) Supporting capital punishment in a particular case or in general. / (biochemistry) triggering cell death

A letter (capital Ð, small ð) introduced into Old English to represent its dental fricative, then not distinguished from the letter thorn, no longer used in English but still in modern use in Icela...

plural of mid-oceanic ridge