Why is "lens" singular and "lenses" plural? Why isn't "lens" the plural of "len"?

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redredred · M

Theres no such thing as a "bicep". "Biceps" is both singular and plural, like "deer" or "sheep"

Crazychick · 36-40, F

@redredred Why don't "deer" and "sheep" add an "s" for plural?

redredred · M

Unlike sixty percent of English, those words are Anglo Saxon in origin and are irregular like one ox or two oxen or one loaf and two loaves, leaf/leaves, man/men, woman/women and lots, lots more@Crazychick