aculeus
(noun) a sharp-pointed process especially a sting of a hymenopterous insect
aculeus
(noun) a stiff sharp-pointed plant process
Source: WordNet® 3.1
aculeus (plural aculei)
(botany) A prickle growing on the bark, as in some brambles and roses.
A sting.
Source: Wiktionary
A*cu"le*us, n.; pl. Aculei. Etym: [L., dim. of acus needle.]
1. (Bot.)
Definition: A prickle growing on the bark, as in some brambles and roses. Lindley.
2. (Zoöl.)
Definition: A sting.
Source: Webster’s Unabridged Dictionary 1913 Edition
12 June 2025
(noun) a decrease in the density of something; “a sound wave causes periodic rarefactions in its medium”
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