Definition of "lenticular"

The sporophyte foot is also characteristic: it is very broad and more or less lenticular or disciform, as broad or broader than the calyptra stalk […]

1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, page 5

The [Royal Albert] bridge itself has approach viaducts on each side, before two 455ft lenticular trusses span the main part of the river, which is 80ft below.

2023 May 3, Philip Haigh, “The art and science of building bridges”, in RAIL, number 982, page 41