anu-ṣṭubh (√ stubh) to praise after, to follow in praising, [Nir.]
anu-ṣṭúbh f. p (nom. °ṣṭúk, [TS.]) following in praise or invocation
a kind of metre consisting of four Pādas or quarter-verses of eight syllables each (according to the [DaivBr.], quoted in [Nir. vii, 12], so called because it anuṣṭobhati i.e. follows with its praise the Gāyatrī, which consists of three Pādas), [RV. x, 130, 4], &c.
(in later metrical systems, the Anuṣṭubh constitutes a whole class of metres, consisting of four times eight syllables)
hence the number eight
speech, Sarasvatī, [L.]
anu-ṣṭúbh mfn. praising, [RV. x, 124, 9.]
see 2. stúbh (p. 1259)