amb noun1 •The outline of a spore or pollen grain, as seen in a polar view.This genus is distinguished from Duplopollis Krutzsch, 1959a, and Cupanieidites Cookson and Pike, 1954, by being syncolpate rather than syncolporate and by the islands at the angles of the amb. — 1970 formsamb's · amb.'s · ambs · ambs.
