A tree of the species Prunus amygdalus (order Rosales). / The seed of this tree, which is unpalatably bitter and bears many times the cyanide of the sweet almond.

Alternative form of bittercress

A citrus tree of the species Citrus ×aurantium, also called Citrus aurantium. / A citrus tree of the species Citrus limetta. / The fruit of these species.

colocynth

Synonym of bitter melon

A disease of apples, caused by the fungus Colletotrichum gloeosporioides.

dolomite

especially Alstonia constricta of New South Wales and Queensland. / Simarouba amara, a neotropical tree. / Petalostigma triloculare (long-leaved bitter bark), of Australia.

A disease of apples and pears, characterised by dark spots of dead cells, believed to be caused by calcium deficiency.

plural of bitter bark