of — de Vaan
of 'witness' in the meaning 'testicle', cf Gr. παραστάται δύο. Leumann 1977: 234 explains antestarifrom*anti-testan. Bibl.: WH II: 676f, EM 689, IEW 1090-92, Coleman 1992: 424, Sihler 1995: 411, Meiser 1998: 80, Untermann 2000: 768-770, LIV *steh2-. -+ tres te trie us 'frowning, stern' [adj. o/a] (Varro+) The connection with terd 'to rub', proposed by WH and IEW, is semantically unconvincing. Possible preforms are … — [de Vaan, s.v. of, p. 632]