aculeous in English dictionary aculeous Meanings and definitions of "aculeous" (obsolete, rare) Pertaining to a needle. adjective (obsolete, rare) Pertaining to a needle. more Grammar and declension of aculeous aculeous ( comparative more aculeous, superlative most aculeous) aculeous (comparative more aculeous, superlative most aculeous) more Sample sentences with "aculeous" Declension Stem Try again Authors