poids

Poids is masculine. While it does derive from Latin "pensum" (neuter), the gender assignment in French is not primarily explained by phonetic sound changes or analogy with other -s nouns. Rather, "poids" became masculine in Old French through a process of reanalysis where the word was associated with masculine gender patterns. The -s ending in French often marks masculine nouns (particularly those that are invariant in singular/plural), and "poids" follows this pattern. The specific mechanism of gender shift from neuter Latin to masculine French is better explained through gender reanalysis and analogy with other masculine nouns in the -s declension class.