From verb tāst, an archaic and dialectal variant of test, tēst (“to cut, to hew, to trim”); the form follows the pattern of lest, lēst, lāse (compare dialectal forms tāsis, tāse; compare also other dialectal variants above). A comparable synonym term exists in Balto-Finnic languages (e.g., Finnish tuohi) which suggests borrowing between Baltic and Balto-Finnic, but the direction of the borrowing is not clear. Cognates include Lithuanian tóšis.
tāss f (6th declension)
- birchbark (white bark of the birch tree, formerly used as writing material)
- bērzu tāss ― birch bark
- tāšu iekuri ― birch (bark) kindling
- tāšu darva ― birch (bark) tar
- tāšu taure ― birch (bark) horn