Arma

weapon, arm

Etymology: Inherited from Old Spanish arma, from Late Latin arma (“weapon”), from Latin arma (“defensive arms”), from Proto-Indo-European *h₂(e)rmos (“fitting”), from the root *h₂er- (“to join”).

third-person singular past historic of armer

weapon, arms; arm, force

Etymology: From Late Latin arma (“weapon”), from Latin arma (“defensive arms, weapons of war, war, defense, tools”), from Proto-Indo-European *h₂(e)rmos (“fitting”), from the root *h₂er- (“to join”).

weapon

Etymology: Inherited from Old Galician-Portuguese arma, from Late Latin arma (“weapon”), from Latin arma (“defensive arms”), from Proto-Indo-European *h₂(e)rmos (“fitting”), from the root *h₂er- (“to join”). Compare Galician arma.

coat of arms

Etymology: From Ottoman Turkish آرما, آرمه (arma), from Italian arma, from Late Latin arma (“weapon”), from Latin arma (“defensive arms, weapons of war, war, defense, tools”), from Proto-Indo-European *h₂(e)rmos (“fitting”).

inflection of arm:; definite singular

to prepare a weapon for firing; to arm, equip

Etymology: Borrowed from Latin armāre, French armer, or Italian armare.

arms, weapons of war, weaponry, instruments (implements of warfare); arms, weapons of war, weaponry, instruments (implements of warfare)

Etymology: From Proto-Indo-European *h₂(e)rmos (“fitting”), from the root *h₂er- (“to join”). armentum is an independent derivation from the same root, as if from Proto-Indo-European *h₂er-mn̥-tom. Cognates include Sanskrit ऋत (ṛtá, “order; right; agreement etc.”) and अरम् (áram, “fitting”), Ancient Greek ἀραρίσκω (ararískō, “to fit together”) and Old Armenian արարի (arari, “I made”). Semantic development was "that what is fitted together" → "tools" → "weapons". Also related to ars, artus, rītus.