Cf. *matn- (1) ‘sinew, tendon, nerve’ (No. 191), related with metathesis?
(pl.t.). To be analyzed as man-ān-, with -ān- as a plural suffix. In most contexts, however, can be equally treated as manān-ū/ī, with a common masc. pl. suff. ū/ī.
Vestiges of -ˀ- in Syr. rather point to *-ˀ- in the protoform; otherwise a biconsonantal root, with doubling of -n- (and probably with insertion of -ˀ as a second radical).
Vestiges of -ˀ- in Arb. rather point to *-ˀ- in the protoform; otherwise a biconsonantal root, with insertion of -ˀ as a second radical in Arb. What is meant is probably rectus abdominis, a straight muscle of the abdomen.
Probably, *-ˀ- in the protoform; otherwise a biconsonantal root, with triconsonantizing strategy, namely inclusion of the -at- suffix into the root as a third radical.