knapsackyoudaoicibaDictYouDict
knapsack: [17] The -sack of knapsack is no doubt essentially the same word as English sack, but the knap- presents slightly more of a problem. The term was borrowed from Low German knappsack, and so probably knapprepresents Low German knappen ‘eat’ – the bag having originally been named because it carried a traveller’s supply of food.
knapsack (n.)youdaoicibaDictYouDict
c. 1600, from Low German Knapsack (Dutch knapzak), probably from knappen "to eat" literally "to crack, snap" + Sack "bag" (see sack (n.1)).
snapshot (n.)youdaoicibaDictYouDict
also snap-shot, 1808, "a quick shot with a gun, without aim, at a fast-moving target," from snap + shot (n.). Photographic sense is attested from 1890. Figuratively, of something captured at a moment in time, from 1897.
synapse (n.)youdaoicibaDictYouDict
"junction between two nerve cells," 1899, medical Latin, from Greek synapsis "conjunction," from or related to synaptein "to clasp, join together, tie or bind together, be connected with," from syn- "together" (see syn-) + haptein "to fasten" (see apse). Introduced by English physiologist Sir Michael Foster (1836-1907) at the suggestion of English classical scholar Arthur Woollgar Verral (1851-1912).
synapsis (n.)youdaoicibaDictYouDict
plural synapses, 1895 in cellular biology, Modern Latin, from Greek synapsis "connection, junction" (see synapse).
anapsidyoudaoicibaDictYouDict
"A reptile of a group characterized by a lack of temporal openings in the skull, including the turtles and their relatives and many early fossil forms", 1930s: from modern Latin Anapsida, from Greek an- 'without' + apsis, apsid- 'arch'.