Source : Wright, Joseph English Dialect Dictionary
web : https://eddonline4-proj.uibk.ac.at/edd/main.html

HOAR, adj.1 Sc. Chs. Also Hmp. I.W. Dev. Also in
forms yar- Chs.1 s.Chs.1; yer- Chs.1 White, hoary. I.W.1
Hence (1) Hoars, sb. pl., fig. white hairs, old age; (2)
Hoar-withy, sb. the white bean, Pyrus Aria; (3) Hoary,
adj. covered with hoar-frost; (4) Hoary-frost, sb. a hoarfrost;
(5) Hoary-morning, sb. (a) a species of apple; (b) a morning
when the ground is covered with hoar-frost.
(1) Edb. If auld age upon you draw, And poortith on your hoars
do fa', Liddle Poems (1821) 154. (2) Hmp. Wise New Forest
(1883) 283; From the white under-surface of the leaves (B. & H.);
Hmp.1 (3) Chs.1 Th' edges are very yarry this morning. s.Chs.1
(4) Chs.1 Three yarry frosts are sure to end in rain, Prov. s.Chs.1
It's a yaa·ri frost [It's a yarry frost]. (5, a) nw.Dev.1 (b) Chs.1,
nw.Dev.1
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HOAR, adj.2 and v. Hrt. Som. 1. adj. Mouldy.
Som. (Hall.)
2. v. Obs. To become mouldy.
Hrt. Bread... will rope or hoar or mould, Ellis Cy. Hswfe.
(1750) 22.
[A hare that is hoar Is too much for a score, When it
hoars ere it be spent, SHAKS. R. & J. II. iv. 143. Cp.
obs. E. hoary, musty, mouldy; Chansi, musty, fusty,
mouldy, hoary, vinewed, COTGR.]

Source : Century Dictionary ( https://en.wikipedia.org/wiki/Century_Dictionary )