(palynology, of a pollen grain) Having relatively narrow muri, not exceeding 20% of the diameter of the lumina

A count backward in fixed units to the time of some event, especially the launch of a space vehicle. / The acts of preparation carried out during this period.

plural of devastavit

(mineralogy) A tetragonal-ditetragonal dipyramidal mineral containing calcium, hydrogen, oxygen, potassium, silicon, sodium, and thorium.