noun
vasculum; botanical specimen case
A container used by botanists to collect and carry plant specimens in the field. A specialized term.
植物採集に行くときは、胴乱を持っていく。
When going plant collecting, I take a vasculum.
noun
satchel; small leather bag
A small, often leather, shoulder bag or satchel. Less common than the botanical sense.
祖父の遺品から古い胴乱が出てきた。
An old leather satchel turned up among my grandfather's belongings.
The word is composed of 胴 (dō, 'trunk, torso') and 乱 (ran, 'disorder'), but the exact derivation is uncertain. It may refer to a container carried against the body.