The headword, presumably extracted from the quotation given, is a feminine noun in the dative plural; see generally LSJ s.v. promolh/ (approach, vestibule).
[1] The first gloss is the same grammatical form as the lemma, but from the noun a)krw/reia, mountain ridge; cf. alpha 1028, kappa 2108 (gloss), mu 269 (gloss), pi 1233 (gloss), and see generally LSJ s.v. The second gloss is again of this form, but from the feminine noun e)coxh/, prominence, elevated feature; cf. alpha 1028 (gloss), delta 772 (gloss), kappa 1867 (gloss), mu 269 (gloss), omicron 1051 (end), pi 16 (gloss), pi 2954 (gloss), and see generally LSJ s.v.
[2] Apparently referring vaguely to the area north of Greece (Gow and Page, vol. II (225)); cf. Barrington Atlas map 50 grid C4 showing Mount Olympus, with Macedonia to its north and Thrace (Barrington Atlas map 51 grids F-H1), quite distant from Olympus, generally to the east of Macedonia.
[3] Greek Anthology 7.9.1-2 (Damagetus, Damagetos), on the tomb of Orpheus; cf. Gow and Page, vol. I (77); vol. II (224-225); and further excerpts from this epigram at alpha 864, alpha 3117, alpha 3204, and kappa 1843. On Orpheus, see generally omicron 654, omicron 655, omicron 656, omicron 657, omicron 658, omicron 659, and omicron 660.