-lac

From Proto-West Germanic *-laik, from Proto-Germanic *-laiką (“jump, spring, sport”), from *laiką (“play, sport, fight, activity”), from Proto-Indo-European *leyg- (“to bounce, shake, tremble”). Related to Proto-Germanic *laikaz (“game, dance, hymn, sport”).

Akin to Old English lāc (“sport, play”). More at English lake (Etymology 2).

• IPA^(key): /lɑːk/

-lāc n

1. noun suffix denoting activity (compare Modern English -ation)

   feohtlāc ― fighting

2. practice, action or process of

   wedlāc ― pledge, plighted troth

3. act of

   hǣmedlāc ― sexual intercourse

4. gift

   frēolāc ― oblation, free-will offering

   sǣlāc ― sea-gift

• Middle English: -lac, -lec, -laik, -lok
  • English: -lock (only in wedlock, bridelock)
  • Scots: -laik, -lok, -locke

Compare -ac. This etymology is incomplete. You can help Wiktionary by elaborating on the origins of this term. Whence the -l-?

-lac (Cyrillic spelling -лац)

1. Suffix appended to words to create a masculine noun, usually denoting a profession, performer or a feature.