tȳw- = tīw-
[ Ð]
[ ðā] I. adv. and conj. then, at that time, Æ, AO, CP: after that time, thereupon, AO, Jul: when, at the time that, whilst, during, AO, B, Bl: there, where, Chr: seeing that, inasmuch as, if, when, since, as, because. ðā ðā when. ðā...ðā then...when. ðā hwīle ðe while, whilst, so long as. ðā gīet v. ðāgīet. [‘tho’]
[II.] asf. and nap. of [sē]. ðā ðe which.
[ ðaca] I. (±) m. roof, covering.
[ ±ðaccian] to clap, pat, stroke, touch gently, CP, Shr: smack, beat, GD. [‘thack’]
ðacele = [ðæcele]
[ ðacian] to thatch, LL 454[10].