ジャンク

• (Tokyo) ジャンク [jáꜜǹkù] (Atamadaka – [1])
• IPA^(key): [d͡ʑã̠ŋkɯ̟]

Ultimately from Malay jong, from Javanese ꦗꦺꦴꦁ (jong), from Old Javanese joṅ (“seagoing ship”), probably from Proto-Mon-Khmer *d₂luuŋ ~ *d₂luŋ ~ *d₂luəŋ ~ *d₂ləŋ (“boat”).

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

ジャンク • (janku) 

1. (nautical) junk (Chinese sailing vessel)

Borrowed from English junk.

ジャンク • (janku) 

1. junk; rubbish
2. recreational drug; narcotic

• ジャンキー (jankī)
• ジャンクフード (janku fūdo)

• “ジャンク”, in デジタル大辞泉 [Digital Daijisen]‎^[1] (in Japanese), Tōkyō: Shogakukan, updated roughly every four months
• “ジャンク” in Weblio Dictionary.