The headword phrase (sic: Adler lemmatizes only the first word of it, and the on-line SOL headword follows suit) is extracted from alpha 2582.
cf. generally under theta 347.
[1] If this is a quotation, it is unidentifiable (though cf. broadly Aelian, On the Nature of Animals 15.17). However, the version of the entry in ps.-Zonaras presents it as more of a definition, seeking to differentiate the application of qhreuth/s from that of the headword's qhra/ths.