The word "Anhistons" is a rare and obscure term. Its correct pronunciation is [ˈænhɪstənz]. It is a plural form of the word "Anhiston," which is an obsolete term for an anti-histamine drug. The spelling of "Anhistons" follows the regular plural rule for nouns ending in "-on," which adds "-s" to form the plural. Although this word may not be familiar to most people, understanding its spelling and pronunciation helps in enriching one's vocabulary and linguistic knowledge.