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From Swedish planka, from Middle Low German.



  1. a plank (long, broad and thick piece of sawn timber)

Usage notes[edit]

  • There's no one exact definition, but generally sawn timber must be at least 38 mm (1,5") thick and 75 mm (3") wide to be called lankku. If the cross-section is close to square, heavy timber will be called parru. A heavy plank may also be called palkki.


Inflection of lankku (Kotus type 1/valo, kk-k gradation)
nominative lankku lankut
genitive lankun lankkujen
partitive lankkua lankkuja
illative lankkuun lankkuihin
singular plural
nominative lankku lankut
accusative nom. lankku lankut
gen. lankun
genitive lankun lankkujen
partitive lankkua lankkuja
inessive lankussa lankuissa
elative lankusta lankuista
illative lankkuun lankkuihin
adessive lankulla lankuilla
ablative lankulta lankuilta
allative lankulle lankuille
essive lankkuna lankkuina
translative lankuksi lankuiksi
instructive lankuin
abessive lankutta lankuitta
comitative lankkuineen
Possessive forms of lankku (type valo)
possessor singular plural
1st person lankkuni lankkumme
2nd person lankkusi lankkunne
3rd person lankkunsa



  • Häkkinen, Kaisa (2004) Nykysuomen etymologinen sanakirja [Modern Finnish Etymological Dictionary] (in Finnish), Juva: WSOY, →ISBN