We don't have synonyms for almach yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are almah, palmach and almac.
(n) :
(astronomy, specifically) The brightest star of the aforementioned star system.
(n) :
(astronomy) A second-magnitude quadruple star, telescopically visible as an apparent double star composed of an orange bright giant and a fifth-magnitude blue-white triple star, marking the left foot of the chained woman in the northern constellation of Andromeda.
(n) :
(astronomy, specifically) The brightest star of the aforementioned star system.
(n) :
(astronomy) A second-magnitude quadruple star, telescopically visible as an apparent double star composed of an orange bright giant and a fifth-magnitude blue-white triple star, marking the left foot of the chained woman in the northern constellation of Andromeda.