What does it mean when something is described as ‘pecorous’?

The obscure word ‘pecorous’ means that something (e.g., a barn) or somewhere (e.g., a stockyard) is full of cows/cattle. Pecudiculture is the raising, or rearing, of cattle, from the Latin “pecud-em”, "a beast"; in plural, "cattle" + "culture". The word format is structured as in !agriculture", "horticulture", "floriculture", etc..

The Latin noun “pecus” originally had several meanings. Zoologically, it could mean a group of large domestic animals: a herd of cattle, horses, or donkeys, such animals in a collective sense: cattle and equines. Figuratively, the word could be used to mean any other group of animals, imagined as a herd or flock, such animals collectively exclusive of humanity. It also acquired a derogatory sense, meaning a mindless group of people: "cattle", "sheep", rabble, the mob.

The Latin plural of “pecus” is “pecora” (“cattle”) from which can be seen the origin of pecorous as it is (rarely) used today meaning an abundance of cows.

With regard to the other answer options, ‘something embezzled is “peculation”, ‘comb-like’ is “pectinal” and ‘having plenty of money’ is “pecunious”.