orthid

plural orthids

1. biologyA brachiopod shell of the genus †Orthis (or allied genera) in the family †Orthidae.
2. soil scienceA mineral soil with ochric epipedon that does not have an argillic or natric horizon.

   —orthid, great group with a horizon with an accumulation of salts more soluble than gypsum.

   1977, Soil Survey Horizons - Volumes 18-19, page 23

   2 more examples

   Orthid soils are used for grazing or are irrigated for crop production if water is available.

   1977, Russell Moore, Thomas Mills, An environmental guide to western surface mining - Parts 1-2, page 13

   When drained, they are comparable in sensitivity to orthid luvisols in an A horizon with a very low clay content.

   2012, H. Barth, P. L'Hermite, Scientific Basis for Soil Protection in the European Community, page 79