From Middle English enselen, inselen, inseilen, from Old English inseġlian (“to place a seal on”), from Proto-West Germanic *insigilōn (compare Old High German insigilōn, insigilen, Old Norse innsigla (“to seal”)), from Latin insigilāre; merged with and reinforced by Old French enseeler, from the same Latin source. Equivalent to en- + seal.
enseal (third-person singular simple present enseals, present participle ensealing, simple past and past participle ensealed)
Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for “enseal”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.)